Modular lighting systems

CROSS-REFERENCE TO RELATED APPLICATIONS

0001This application claims the benefit of the following provisional applications, each of which is hereby incorporated by reference in its entirety:

0002United States Provisional Application No. <patcit id="pcit0001" dnum="US61044591B"><text>61/044,591, filed April 14, 2008</text></patcit>; United States Provisional Application No. <patcit id="pcit0002" dnum="US61055727B"><text>61/055,727, filed May 23, 2008</text></patcit>; United States Provisional Application No. <patcit id="pcit0003" dnum="US61084367B"><text>61/084,367, filed July 29, 2008</text></patcit>; United States Provisional Application No. <patcit id="pcit0004" dnum="US61102159B"><text>61/102,159, filed October 2, 2008</text></patcit>; United States Provisional Application No. <patcit id="pcit0005" dnum="US61108698B"><text>61/108,698, filed October 27, 2008</text></patcit>; and United States Provisional Application No. <patcit id="pcit0006" dnum="US61109009B"><text>61/109,009, filed October 28, 2008</text></patcit>.

BACKGROUND OF THE INVENTION

Field of the Invention

0003The present invention relates to lighting systems.

Description of Related Art

0004Conventional systems for retrofit lighting applications are known by various parameters such as fixture mounting height, spacing, beam pattern, light level and some other parameters. However, none of the systems discloses a one-size-fits-all approach to include a large number of fixtures. In addition, the installation of such systems may be costly due to expenses incurred on wiring and power. Also, conventional systems may rely on low-tech occupancy or ambient light sensors that may not be feasible solutions with respect to environmental conditions. Additionally, these systems may not be equipped to include variability in electricity pricing models.

0005Therefore, there is a need for improved lighting systems in both retrofit and new applications.

SUMMARY OF THE INVENTION

0006Various embodiments of the present invention disclose modular designs of lighting systems that may be employed in a variety of environments. These lighting systems may employ lighting fixtures that may be LED or non-LED based, or a combination of both and that may be modularly designed for different directions and beam angles.

0007An aspect of the present invention discloses methods and systems for managing lighting in a plurality of environments, such as warehouse, manufacturing facility, parking garages, street lighting, prisons, gymnasiums, indoor pools, stadiums, bridges, tunnels, and some other types of environments.

0008Embodiments of the present invention may disclose methods and systems for delivering light as a resource by controlling and managing lighting systems based on mutually agreed parameters between an operator of the environment and a third party.

0009In an embodiment of the present invention, methods and systems may be provided for managing lighting in the environment based on information regarding energy demand.

0010In an aspect of the present invention, methods and systems may be disclosed for managing lighting in the environment based on the alternative energy and utility energy demand information.

0011Embodiments of the present invention may also disclose methods and systems for managing lighting in the environment based on the information regarding alternative/utility energy storage.

0012In an embodiment, methods and systems may be provided for regulating the lighting systems through a network based on the assessment of various demand information.

0013In an aspect of the present invention, methods and systems for managing lighting systems in the environment may include measuring lighting conditions in the environment and validating them based on mutually agreed parameters.

0014In another aspect of the present invention, modular lighting systems with variable lumen output and beam angles may be provided.

0015In an embodiment, modular lighting systems with management units and frames may be provided.

0016Embodiments of the present invention may disclose centrally controlled intelligent lighting systems for management of high bay fixtures in various environments.

0017In an embodiment, the control may be a wireless control.

0018In an aspect of the present invention, methods and systems for management of the lighting systems by performing lighting predictions based on past performance of the lighting systems may be provided.

0019Embodiments of the present invention may disclose use of sensors and tracking tools for intelligently managing the lighting in the environments.

0020In other embodiments, various lighting systems including fixtures with variable luminous efficacy, modular power connector system, and user-replaceable optical component may be provided.

0021In another embodiment, lighting systems with LED multi-head may be provided.

0022In another embodiment, lighting systems with integral emergency lighting function, integrated RFID reader, lighting control system with electricity demand response interface, integrated electricity time-shift, integrated payment gateway, integrated camera for facility security systems, and ruggedized or explosion-proof LED fixture with integrated sensing and network, may be provided.

0023In an aspect of the present invention, methods and systems may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, storing a plurality of mutually agreed upon lighting parameters in a database, regulating the artificial lighting in the environment in accordance with the stored lighting parameters by automatically making a lighting measurement in the environment, comparing the lighting measurement with at least one of the stored lighting parameters, and making an adjustment to at least one of the lighting systems through the data network in accordance with the comparison. The lighting measurement in the environment may also be the measurement of a light level in the environment that may include natural light. Each of the plurality of the lighting systems may be associated with a data network and may be controlled through it. The mutual agreement for storing the lighting parameters may be between an operator of the environment and a third party manager of the artificial lighting.

0024The method may further include a third party manager user interface that may be adapted to provide the third party manager of the artificial lighting with tools for adjusting at least one of the lighting systems. The third party manager user interface may be adapted to provide the third party manager of the artificial lighting with tools for changing at least one of the plurality of stored lighting parameters. Further, the third party manager user interface may be adapted to provide the third party manager of the artificial lighting with tools for adding a new lighting parameter to the plurality of stored lighting parameters. Furthermore, the third party manager user interface may be adapted to provide the third party manager of the artificial lighting with tools for removing at least one of the lighting parameters from the plurality of stored lighting parameters. Still further, the third party manager user interface may be adapted to provide the third party manager of the artificial lighting with tools for manually overriding the automated decisions made according to the stored lighting parameters. The third party manager user interface may also be adapted to provide the third party manager of the artificial lighting with tools for determining which of the stored lighting parameters may be modified by the operator of the environment. Similarly, the method may include an operator user interface that may be adapted to provide an operator of the environment with tools for adjusting at least one of the lighting systems. In other embodiments, the operator user interface may be adapted to provide an operator of the environment with tools for changing at least one of the plurality of stored lighting parameters. In another embodiment, the operator user interface may be adapted to provide an operator of the environment with tools for visualizing the energy consumed by at least one of the lighting systems.

0025In embodiments, at least one of the lighting systems may be an LED lighting system. In embodiments, the beam angle produced by the LED lighting system may be altered, wherein the alteration may be a result of the comparison. Further, the LED lighting system may include a plurality of LED light strips; each of the plurality of light strips may produce a beam angle projected to cover a different area. In embodiments, the different areas may be in part overlapping. In embodiments, the method may further include storing a plurality of energy demand parameters wherein each of the plurality of energy demand parameters may be associated with a lighting regulation parameter such that when energy demand information is provided, at least one lighting system may be controlled in accordance with the lighting regulation parameter. This energy demand parameter may relate to utility energy demand and/or alternate energy demand.

0026In embodiments, a method and system may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, receiving energy demand information, comparing the energy demand information to an energy demand parameter stored in a database, evaluating the comparison according to a rule stored in a database, and communicating lighting control information through the data network to regulate at least one of the lighting systems in the environment in accordance with the evaluation. Each of the plurality of lighting systems may be associated with and controlled through the data network.

0027In embodiments, the regulation of at least one lighting system may involve regulating the beam angle of the light emitted from at least one lighting system. The regulation may also involve regulating the light intensity in a portion of the beam angle emitting from one or more lighting systems. The regulation of the lighting system may further involve modifying the intensity of at least one lighting system based on sensors placed in the environment. Change in at least one of the rules used to manage the behavior of at least one lighting system and modification of the amount of time the one lighting system may be turned on in response to sensor inputs may form part of the regulation of the lighting system. In addition, the regulation of at least one lighting system may involve modifying the brightness of some subset of the lights of the one or more lighting system.

0028In embodiments, the method may further include providing an energy provider user interface adapted to provide the energy provider with tools for adjusting at least one of the lighting systems. In embodiments, the method may also include providing an energy provider user interface adapted to provide the energy provider with tools for changing at least one of the pluralities of stored lighting parameters.

0029In embodiments, the method may include providing an energy provider user interface adapted to provide the energy provider with tools for adding a new lighting parameter to the plurality of stored lighting parameters. Further, the energy provider user interface may be adapted to provide the energy provider with tools for removing at least one of the lighting parameters from the plurality of stored lighting parameters. In other embodiments, energy provider user interface may be adapted to provide the energy provider with tools for manually overriding the automated decisions made according to the stored lighting parameters. In embodiments, the method may comprise providing an energy provider user interface adapted to provide the energy provider with tools for manually overriding the automated decisions made according to the stored lighting parameters. The method may also include providing an energy provider user interface adapted to provide the energy provider with tools for determining which of the stored lighting parameters may be modified by the operator of the environment. In another embodiment, the method may comprise providing an operator user interface adapted to provide the operator of the environment with tools for changing at least one of the pluralities of stored lighting parameters and for adjusting at least one of the lighting systems. Further, the operator user interface may be adapted to provide an operator of the environment with tools for visualizing the energy consumed by at least one of the lighting systems.

0030In an aspect of the present invention, a method and system may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, storing energy produced by an alternative energy source for use at a time different from when it is generated by the alternative energy source, and receiving utility energy demand information. Each of the plurality of lighting systems may be associated with the data network and controlled through the data network. The method may also include comparing the received utility energy demand information to a utility energy demand parameter stored in a database and making an assessment of the options of using utility energy and using the stored energy produced by the alternative energy source. Based on the assessment, at least one of the utility energy and the stored energy for use by the plurality of lighting systems may be selected, and at least one of the lighting systems may be regulated.

0031In embodiments, the regulation of at least one lighting system may involve regulating the beam angle of the light emitted from at least one lighting system, as well as regulating the light intensity in a portion of the beam angle emitting from the one lighting system. The regulation of at least one lighting system may also involve regulating the intensity of the one lighting system based on sensors placed in the environment and modifying at least one of the rules used to manage the behavior of at least one lighting system. The lighting system regulation may further include modification of the amount of time that at least one lighting system is turned on in response to sensor inputs and modification of the brightness of some subset of the lights making up at least one lighting system.

0032In embodiments, the method may further include providing an operator user interface adapted to provide the operator of the environment with tools for adjusting at least one of the lighting systems, tools for changing at least one of the pluralities of stored lighting parameters, and/or tools for visualizing the energy consumed by at least one of the lighting systems.

0033In another aspect of the present invention, a method and system may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, receiving energy from an alternative energy source, receiving information about the amount, kind, and expense of energy available from the alternative energy source, and receiving utility energy demand information. The utility energy demand information may be compared to a utility energy demand parameter stored in a database, and an assessment may be made of the options of using utility energy and using the alternative energy. Based on the assessment, selection may be done of at least one of the utility energy and the alternative energy for use by the plurality of lighting systems; and at least one of the lighting systems may be regulated through the data network based on the assessment. Each of the plurality of lighting systems may be associated with a data network, and each of the plurality of lighting systems may be controlled through the data network.

0034In yet another aspect of the present invention, a method and system may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, storing energy produced by an alternative energy source for use at a time different than when it is generated by the alternative energy source; receiving information about the amount, kind, and expense of energy stored from the alternative energy source, and receiving utility energy demand information. The utility energy demand information may be compared to a utility energy demand parameter stored in a database, and an assessment may be made of the options of using utility energy and using the alternative energy. Based on the assessment, at least one of the utility energy and the alternative energy may be selected for use by the plurality of lighting systems; and at least one of the lighting systems may be regulated through the data network based on the assessment. Each of the plurality of lighting systems may be associated with a data network, and each of the plurality of lighting systems may be controlled through the data network.

0035In embodiments, the regulation of at least one lighting system may involve regulating the beam angle of the light emitted from the one lighting system, as well as regulating the light intensity in a portion of the beam angle emitting from at least one lighting system. The regulation of at least one lighting system may rely on the intensity of the one lighting system based on sensors placed in the environment and may require modification of at least one of the rules used to manage the behavior of at least one lighting system. The regulation of at least one lighting system may further involve modifying the amount of time the one lighting system is turned on in response to sensor inputs and the brightness of some subset of the lights making up at least one lighting system.

0036In embodiments, the method may further include providing an operator user interface adapted to provide the operator of the environment with tools for adjusting at least one of the lighting systems, tools for changing at least one of the pluralities of stored lighting parameters, and/or tools for visualizing the energy consumed by at least one of the lighting systems.

0037In another aspect of the present invention, a method and system may be provided for managing artificial lighting in an environment. The method may include providing a plurality of lighting systems in the environment, storing a plurality of mutually agreed upon lighting parameters in a database, and automatically measuring lighting conditions in the environment to check compliance of the artificial lighting in the environment based on the agreed upon lighting parameters. Each of the plurality of lighting systems may be associated with a data network, and each of the plurality of lighting systems may be controlled through the data network. The mutual agreement pertaining to the storing of the mutually agreed upon lighting parameters in a database may be between the operator of the environment and the third party manager of the artificial lighting.

0038In embodiments, the automatic measurements may relate to levels of brightness in an environment. In embodiments, the automatic measurements may also relate to the operating status of the lighting system which in turn may relate to the power consumed by the lighting system. The operating status may further relate to whether the individual light fixtures are operational. The operating status may also relate to the amount of time for which the individual light fixtures may have been operational ("run hours") and whether the lighting system has been tampered with. The operating status may relate to third party systems to which the lighting system may be interconnected.

0039In embodiments, the automatic measurements may be made periodically. In other embodiments, the automatic measurements may be made upon the occurrence of an event where the event may be a time of day, a sensor response, a manual request, or the event may be based on an energy demand parameter.

0040In embodiments, a report may be generated based on the compliance check. The report may include percentage of time out of compliance, percentage of time in compliance, a cost of energy used to maintain compliance, an indication of how much alternatively generated energy was used to maintain compliance, a reconciliation of received energy cost estimates during operation of the lighting in the environment and the actual energy costs incurred, an indication of lighting system efficiencies, an indication of lighting system maintenance costs, an indication of when lighting system maintenance may be required, an indication of when lighting system maintenance may be desirable, and some other related parameters.

0041In embodiments, at least one of the lighting systems may be an LED lighting system. In embodiments, the beam angle produced by the LED lighting system may be altered, wherein the alteration may be a result of the comparison. Further, the LED lighting system may include a plurality of LED light strips where each of the plurality of light strips may produce a beam angle projected to cover a different area. In embodiments, the different areas may in part be overlapping.

0042In an aspect of the present invention, a method and system may be provided for assembling a luminaire out of components in a modular fashion. The method may include selecting a plurality of light modules, selecting a plurality of power management modules, and selecting a fixture frame that may provide mechanical support for the plurality of light modules and plurality of power management modules. Each of the plurality of light modules may produce a prescribed lumen output according to a prescribed beam angle distribution. Additionally, each of the plurality of power management modules may control power for one or more of the plurality of light modules.

0043In embodiments, the fixture frame that may provide mechanical support for the plurality of light modules and plurality of power management modules may also provide a mechanism for rotating the light module around one or two axes. The light modules mounted in a fixture may be individually controlled through data received on a data port. The beam distribution of the individual light modules may be modified by a user-replaceable optical assembly and an overall aggregate beam angle produced by the luminaire may be modified by a user-replaceable optical assembly.

0044In embodiments, the steps of the above process for assembling the luminaire may be embodied in a software application meant to guide a purchaser of the luminaire in the luminaire's construction.

0045In embodiments, a method and system may be provided related to a device for providing power to a plurality of LEDs. The method may include a power input; a first power output, for connecting to one or more strings of LEDs, a second power output, for providing a regulated low-voltage supply to accessories, and a network data input that can be used to control the power provided to the LEDs.

0046In embodiments, the method may further include a second data input for the receipt of analog data and a second data input for the receipt of digital data.

0047In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, wherein at least one of the plurality of light bars is arranged to rotate along at least one rotational axis independent of the orientation of the housing, wherein the rotatable LED light bar is arranged in the lighting fixture such that it is used to change the aggregate beam angle of light emitted from the lighting fixture when its angle of rotation is substantially changed. The fixture may further comprise an enclosure within the housing for disposing at least one sensor module, wherein the sensor module is in electrical communication with at least one of the plurality of LED light bars, wherein the surface of a sensor module lens is arranged to be close to a bottom plane of the fixture to achieve a maximum of sensor input angles.

0048In an aspect of the invention, a lighting fixture may comprise a plurality of light emitting diode (LED) light bars mounted within a housing, wherein at least one of the plurality of light bars is constructed and arranged to rotate around one or two axes, wherein the rotatable LED light bar is arranged in the lighting fixture such that it is used to change the aggregate beam angle of light emitted from the lighting fixture when its angle of rotation is substantially changed, and an angle indicator disposed on at least one of the LED light bar and the housing for indicating an angular adjustment of the LED light bar. The angle indicator may be a detent. The angle indicator may be a visual scale of at least one of degrees, numbers, and letters.

0049In an aspect of the invention, a method for altering an aggregate beam pattern may comprise mounting a plurality of light emitting diode (LED) light bars within a housing, wherein at least one of the plurality of LED light bars is a variable light intensity LED light bar, and electrically connecting a driver circuit to the at least one variable light intensity LED light bar for controlling a variable load applied to the at least one LED light bar, wherein the luminous output of the at least one LED light bar is varied in response to a change in the load. Each LED light bar may be controlled by a dedicated driver circuit. The plurality of LED light bars may be controlled by a shared driver circuit and a controllable shunt across each LED light bar allows for individual control. At least one of the plurality of light bars ay include a rotational drive constructed and arranged to rotate the at least one LED light bar along at least one rotational axis independent of the orientation of the housing.

0050In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, wherein at least one of the plurality of LED light bars has a different beam pattern, wherein the beam pattern of the at least one LED light bar is modified by an optical assembly.

0051In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars arranged within a housing, and a processor arranged to receive local sensor input and to adjust an intensity of light emitted from the plurality of LED light bars in response to the received local sensor input, wherein the processor is disposed in an enclosure mounted within the fixture, and wherein at least one LED light bar is arranged to rotate along at least one axis.

0052In an aspect of the invention, a computer program product embodied in a computer readable medium that, when executing on one or more computers, may perform the steps of storing LED light bar input data in the memory of the computer, receiving input on at least one parameter associated with a lighting area, receiving input on at least one desired lighting characteristic for the lighting area, and selecting at least one of a number of LED light bars, an optical profile for the LED light bars, an LED light bar fixture frame and an angular setting for the LED light bars based on the input.

0053In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and an enclosure within the housing for disposing at least one sensor module, wherein the sensor module is in electrical communication with at least one of the plurality of LED light bars, wherein the surface of a sensor module lens is arranged to be close to a bottom plane of the fixture to achieve a maximum of sensor input angles, and wherein at least one of the plurality of LED light bars is modified by an optical assembly to emit a different beam pattern. The sensor may have swappable lenses. A variety of lenses may be carried on a lens wheel and rotated into place. The sensor enclosure may accept at least one of a PIR, ambient light, radiation, and particulate sensor, each of which is field-installable and field-swappable. The optical element for each sensor module may be field-swappable based on usage. The usage may be end of aisle vs. center vs. general wide field-of-view. Each sensor module may contain several types of optics which are selectable via a "lens-wheel" which could rotate different optics in front of the sensor, allowing an installer to select the proper optical configuration at time of installation.

0054In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and a power management module (PMM) that supplies power to a plurality of sensor modules, wherein the PMM provides DC power and bidirectional data communication to a plurality of sensors along at least two data conductors, and wherein the PMM controls at least one of the plurality of LED light bars based on one or more inputs from the plurality of sensors. The sensors may be adapted to transmit an identification signal to the processor. The PMM may respond to the sensor module in accordance with the transmitted identification signal.

0055In an aspect of the invention, a lighting fixture may include an LED lighting system mounted within a housing, and a processor arranged to receive and process multiple sources of input data and adjust an LED lighting system parameter in response to the data in accordance with at least one rule stored in a memory of the processor, wherein the rule determines a weight to apply to each of the input signals, combines those weighted signals via an arbitration algorithm, and determines the adjustment to the LED lighting system parameter according to the output of the algorithm. The input data may include at least one of sensors connected to the fixture, sensor data conveyed from a remote sensor via a network, centralized commands, and utility inputs. The LED lighting system parameter may be at least one of the fixture's light level and the fixture's power consumption.

0056In an aspect of the invention, a lighting fixture may include an LED lighting system mounted within a housing, and a power management module comprising multiple sources of power input and a processor in electrical communication with the LED lighting system, wherein the processor is arranged to receive information about the impact of consuming power from each of the sources of input power, combine the impact information via an arbitration algorithm, and select which power input to utilize based on the output of the algorithm in accordance with at least one rule stored in a memory of the processor. At least one of the sources of input power may be an energy storage device connected directly to one or more lighting fixtures. The energy storage device may be a battery. The energy storage device may be an ultracapacitor. The information may be at least one of price per kWh, amount of kWh remaining in a storage device, and instantaneous power available from a renewable energy source. At least one of a plurality of LED light bars of the LED lighting system may be arranged to rotate along at least one rotational axis independent of the orientation of the housing. The rotatable LED light bar may be arranged in the lighting fixture such that it is used to change the aggregate beam angle of light emitted from the lighting fixture when its angle of rotation is substantially changed. The fixture may further include an enclosure within the housing for disposing at least one sensor module, wherein the sensor module may be in electrical communication with at least one of a plurality of LED light bars of the LED lighting system, wherein the surface of a sensor module lens may be arranged to be close to a bottom plane of the fixture to achieve a maximum of sensor input angles. The fixture may further include an angle indicator disposed on at least one of the LED light bar and the housing for indicating an angular adjustment of the LED light bar. At least one of a plurality of LED light bars of the LED lighting system may be a variable light intensity LED light bar. The fixture may further include electrically connecting a driver circuit to the at least one variable light intensity LED light bar for controlling a variable load applied to the at least one LED light bar, wherein the luminous output of the at least one LED light bar is varied in response to a change in the load. In the fixture, the processor may be further arranged to receive and process multiple sources of input data and adjust an LED lighting system parameter in response to the data in accordance with at least one rule stored in a memory of the processor. The rule may determine a weight to apply to each of the input signals, combine those weighted signals via an arbitration algorithm, and determine the adjustment to the LED lighting system parameter according to the output of the algorithm. The power management module may provide DC power and bidirectional data communication to a plurality of sensors of one or more lighting fixtures along at least two data conductors. The processor may be arranged to communicate with at least one of a plurality of LED light bars of the lighting system to obtain identifying information about the LED light bar and store the identifying information in a memory of the processor in a form accessible by a user of the lighting fixture. The fixture may further include a heatsink disposed on the housing, wherein the fins of the heatsink are oriented perpendicular to an axis of rotation of an LED light bar of the lighting system. The fixture may further include a thermal interface pad disposed along an upper surface of the housing in contact with a mounting surface, wherein the thermal interface pad enables transfer of heat energy from the LED lighting system to the mounting surface. The fixture may further include a heat pipe system integrated with the fixture, wherein the heat pipe system comprises a radiator attached to a pole for mounting the fixture and a thermal transfer material flowing between the radiator and the heat pipe system within the fixture. The fixture may further include a waste heat recovery facility disposed within the housing for converting waste heat from the LED lighting system to electrical power, and a circuit for directing the electrical power generated from the waste heat to a power input for the lighting fixture. The fixture may further include an electrostatic element disposed on a surface of the housing, wherein the element is charged by drawing power from the lighting fixture, wherein the electrostatic element attracts charged air particles, causing an airflow of charged air particles through the lighting fixture.

0057In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, a processor in electrical communication with the plurality of LED light bars, wherein the processor is arranged to communicate with at least one of the plurality of LED light bars to obtain identifying information about the LED light bar, and a memory of the processor for storing the identifying information in a form accessible by a user of the lighting fixture. The identifying information may include at least one of beam angle, rotational position, lumen output, CCT, run hours, operating voltage, drive current [min/max/nominal], and thermal constraints [max ambient]. The identifying information may be calculated or predicted based on at least one of beam angle, rotational position, lumen output, CCT, run hours, operating voltage, drive current [min/max/nominal], and thermal constraints [max ambient]. The identifying information may be stored in a nonvolatile memory onboard the LED light bar, and communicated via a digital bus to the processor. The identifying information may be stored passively on the LED light bar and can be read by the processor. The passive storage may include electrical contacts with encoded bit pattern stored in an optics holder. The passive storage may include passive RFID. The identifying information may be stored via a mechanism integrated into the housing and/or light bar for sensing angular position of the LED light bar inside the housing. The mechanism may include an encoder-style code on an end plate of the LED light bar. The mechanism may include an accelerometer disposed on the LED light bar. The identifying information may be stored via a passive power-up modulation sensing scheme, such as delta-t to full current consumption. The processor may be able to signal LED light bar type to users or operators for light bar replacement purposes. The signal may be via a tricolor LED on the LED light bar or PMM with the LED light bar type indicated via color code, via an LED on the LED light bar or PMM which blinks according to code to indicate LED light bar type, via a handheld scanner which reads encoded IR or visible light from the lighting fixture to determine type, and can be activated with laser detector or IR handshake, or via RF transmission of LED light bar types to remote diagnostic equipment.

0058In an aspect of the invention, a computer program product embodied in a computer readable medium that, when executing on one or more computers may perform the steps of querying an LED lighting fixture comprising a plurality of LED light bars mounted within a housing for identifying information, receiving and storing the identifying information in a power management module of the LED lighting fixture in a form accessible by a user of the LED lighting fixture, and displaying the identifying information to a user of the LED lighting fixture.

0059In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, a processor in electrical communication with the plurality of LED light bars, wherein the processor is arranged to communicate with at least one of the plurality of LED light bars to obtain identifying information about the LED light bar and auto-calibrate the power input to each LED light bar based on the identifying information. The identifying information may include at least one of beam angle, rotational position, lumen output, CCT, run hours, operating voltage, drive current [min/max/nominal], and thermal constraints [max ambient]. The identifying information may be calculated or predicted based on at least one of beam angle, rotational position, lumen output, CCT, run hours, operating voltage, drive current [min/max/nominal], and thermal constraints [max ambient]. The identifying information may be stored in a nonvolatile memory onboard the LED light bar, and communicated via a digital bus to the processor. The identifying information may be stored passively on the LED light bar and can be read by the processor. The passive storage may include electrical contacts with encoded bit pattern stored in an optics holder. The passive storage may include passive RFID. The identifying information may be stored via a mechanism integrated into the housing and/or light bar for sensing angular position of the LED light bar inside the housing. The mechanism may include an encoder-style code on an end plate of the LED light bar. The mechanism may include an accelerometer disposed on the LED light bar. The identifying information may be stored via a passive power-up modulation sensing scheme, such as delta-t to full current consumption. The processor may be able to signal LED light bar type to users or operators for light bar replacement purposes. The signal may be via a tricolor LED on the LED light bar or PMM with the LED light bar type indicated via color code, via an LED on the LED light bar or PMM which blinks according to code to indicate LED light bar type, via a handheld scanner which reads encoded IR or visible light from the lighting fixture to determine type, and can be activated with laser detector or IR handshake, or via RF transmission of LED light bar types to remote diagnostic equipment.

0060In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, wherein at least one of the plurality of light bars is a rotatable LED light bar, wherein the rotatable LED light bar is arranged in the lighting fixture such that it is used to change a beam angle of light emitted from the lighting fixture when its angle of rotation is substantially changed, and a heatsink disposed on the housing, wherein the fins of the heatsink are oriented perpendicular to the axis of rotation of the LED light bar. The long edges of the fins may be undercut to enable additional airflow. The cross-sectional profile of the heat sink may be designed to perform optimally within a continuous range of rotation along the long axis of the LED light bar.

0061In an aspect of the invention, a flush-mount lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and a thermal interface pad disposed along an upper surface of the housing in contact with a mounting surface, wherein the thermal interface pad enables transfer of heat energy from the LED light bars to the mounting surface.

0062In an aspect of the invention, a pole-mounted lighting fixture may include a light emitting diode (LED) light bar mounted within a housing attached to a pole, and a heat pipe system integrated with the fixture, wherein the heat pipe system comprises a radiator attached to the pole and a thermal transfer material flowing between the radiator and the heat pipe system within the fixture. The radiator may be self-orienting into prevailing winds.

0063In an aspect of the invention, a lighting fixture may include a light emitting diode (LED) light bar mounted within a housing, a water reservoir embedded within the fixture for capturing atmospheric water, and an evaporative cooling element in fluid communication with the water reservoir that absorbs heat from the LED light bar and causes the evaporative cooling of the fixture.

0064In an aspect of the invention, a lighting fixture may include a light emitting diode (LED) light bar mounted within a housing, a waste heat recovery facility disposed within the housing for converting waste heat from the LED light bar to electrical power, and a circuit for directing the electrical power generated from the waste heat to a power input for the lighting fixture.

0065In an aspect of the invention, a lighting fixture may include a light emitting diode (LED) light bar mounted within a housing, and an electrostatic element disposed on a surface of the housing, wherein the element is charged by drawing power from the lighting fixture, wherein the electrostatic element attracts charged air particles, causing an airflow of charged air particles through the lighting fixture.

0066In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and a laser mounted on at least one LED light bar for indicating a direction of emitted light from the LED light bar.

0067In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and a mask mounted on at least one LED light bar for sharpening the edges of the light emitted from the LED light bar, wherein sharpening enables determining a direction of emitted light from the LED light bar.

0068In an aspect of the invention, a lighting fixture may include a plurality of light emitting diode (LED) light bars mounted within a housing, and a level mounted on at least one LED light bar for indicating the relative position of LED light bar with respect to level.

0069In an aspect of the invention, a wireless communication network adapted for use in controlling a plurality of lighting fixtures, the wireless communication network may include a plurality of lighting fixtures, the lighting fixtures comprising a plurality of light emitting diode (LED) light bars mounted within a housing, at least one sensor integrated in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, wherein when a sensor data signal is received by a lighting fixture, a built-in processor processes the sensor data signal and transmits a control command to the lighting fixture in accordance with at least one rule stored in a memory of the processor.

0070In an aspect of the invention, a method of automatically mapping a network of lighting fixtures may include placing a plurality of lighting fixtures in a lighting area, the lighting fixtures comprising a plurality of light emitting diode (LED) light bars mounted within a housing, integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, collecting performance data relating to the network of lighting fixtures, wherein the performance data are at least one of sensor data signal strength and the hop count of a sensor data signal from one lighting fixture to another, and generating a representation of the network of lighting fixtures based upon the lighting fixture placement and the network performance data. The representation may be used to construct a rule database stored on at least one lighting fixture or in a centralized network controller. The representation may be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the sensorless fixtures should receive sensor data signals.

0071In an aspect of the invention, a method of automatically mapping a network of lighting fixtures may include placing a plurality of lighting fixtures in a lighting area, the lighting fixtures comprising a plurality of light emitting diode (LED) light bars mounted within a housing, integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, wherein the sensor data signal comprises a unique identifying signal, and generating a representation of the network of lighting fixtures based upon the detection of transmitted unique identifying signals by at least one neighboring lighting fixture of the transmitting lighting fixture. The representation may be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the sensorless fixtures should receive sensor data signals.

0072In an aspect of the invention, a method of mapping a network of lighting fixtures may include placing a plurality of lighting fixtures in a lighting area, the lighting fixtures comprising a plurality of light emitting diode (LED) light bars mounted within a housing, integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures or an outside source and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, selecting neighbors of each lighting fixture by detecting a sensor data signal transmitted to at least one lighting fixture from an outside source, wherein the sensor data signal comprises neighbor information, and generating a representation of the network of lighting fixtures based upon the detection of transmitted sensor data signals from the outside source. The transmitted sensor data signal may be a laser signal. The transmitted sensor data signal may be a remote control IR signal. The representation ay be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the sensorless fixtures should receive sensor data signals.

0073In an aspect of the invention, a method of cooperative failure compensation in a network of lighting fixtures may include placing a plurality of lighting fixtures in a lighting area, the lighting fixtures comprising a plurality of light emitting diode (LED) light bars mounted within a housing, detecting a failure event of at least one of the plurality of LED light bars, determining a neighbor of the failed LED light bar based on consulting a network topology, and overdriving the neighboring LED light bar to compensate for the failure event. When one fixture or part of a fixture fails, neighboring fixtures may detect this and increase their light level to maintain desired light on surfaces. Sensing may occur via sensing onboard or via notification over network. The PMM can intelligently detect the presence of a dead light bar by sequencing through output channels and detecting power consumption at each step.

0074These and other systems, methods, objects, features, and advantages of the present invention will be apparent to those skilled in the art from the following detailed description of the preferred embodiment and the drawings. All documents mentioned herein are hereby incorporated in their entirety by reference.

BRIEF DESCRIPTION OF THE DRAWINGS

0075<ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Figs. 1a</figref> and <figref idref="f0002">1b</figref> depict an exemplary environment where various embodiments of the present invention may be practiced and realized;</li><li><figref idref="f0003">Fig. 2</figref> depicts the management of artificial lights in the environment based on the comparison of various lighting measurements with stored parameters, in accordance with an embodiment of the present invention;</li><li><figref idref="f0004">Fig. 3</figref> depicts the management of artificial lights in the environment based on energy demand response, in accordance with an embodiment of the present invention;</li><li><figref idref="f0005">Fig. 4</figref> depicts the management of the lighting systems in the environment based on the assessment regarding the utility energy and the stored alternative energy, in accordance with an embodiment of the present invention;</li><li><figref idref="f0006">Fig. 5</figref> depicts the management of lighting systems in the environment on the basis of various lighting measurements, in accordance with an embodiment of the present invention;</li><li><figref idref="f0007">Fig. 6</figref> depicts an exemplary modular luminaire system, in accordance with an embodiment of the present invention;</li><li><figref idref="f0008">Fig. 7</figref> depicts a power management module, in accordance with an embodiment of the present invention;</li><li><figref idref="f0009">Fig. 8</figref> depicts a quick release mechanism for light fixtures, in accordance with an embodiment of the present invention;</li><li><figref idref="f0010">Fig. 9</figref> depicts a mechanism of status indication by colored LEDs on luminaires, in accordance with an embodiment of the present invention;</li><li><figref idref="f0011">Fig. 10</figref> depicts a finned heat sink design for thermal management in lighting systems, in accordance with an embodiment of the present invention;</li><li><figref idref="f0012">Fig. 11</figref> depicts a passive electrostatic forced air cooling mechanism for thermal management in lighting systems, in accordance with an embodiment of the present invention;</li><li><figref idref="f0013">Fig. 12</figref> depicts a remote phosphor over a reflector cup, in accordance with an embodiment of the present invention;</li><li><figref idref="f0014">Fig. 13</figref> depicts an exemplary design of a mask template for lighting systems, in accordance with an embodiment of the present invention;</li><li><figref idref="f0015">Fig. 14</figref> depicts billing information management via a third party software, in accordance with an embodiment of the present invention;</li><li><figref idref="f0016">Fig. 15</figref> depicts an advanced dimming characteristic of outdoor lighting systems, in accordance with an embodiment of the present invention; and</li><li><figref idref="f0017">Fig. 16</figref> depicts an intelligent sensing mechanism for traffic information management, in accordance with an embodiment of the present invention.</li><li><figref idref="f0018">Figs. 17A and 17B</figref> depict a fixture with rotatable light bars.</li><li><figref idref="f0019">Fig. 18</figref> depicts a fixture with angular adjustment indicators.</li><li><figref idref="f0020">Figs. 19A and 19B</figref> depict a fixture with individual light module dimming.</li><li><figref idref="f0021">Figs. 20A and 20B</figref> depict a fixture with reconfigurable beam pattern.</li><li><figref idref="f0022">Figs. 21A and 21B</figref> depict a fixture with intelligent light modules.</li><li><figref idref="f0023">Fig. 22</figref> depicts a flow diagram of a configuration tool for modular lighting system.</li><li><figref idref="f0024">Fig. 23</figref> depicts a fixture with integral sensor bay.</li><li><figref idref="f0025">Fig. 24</figref> depicts a power management module with modular sensor bus.</li><li><figref idref="f0026">Fig. 25</figref> depicts a power management module with multi-input arbitration.</li><li><figref idref="f0027">Fig. 26</figref> depicts a power management module with power source arbitration.</li><li><figref idref="f0028">Fig. 27</figref> depicts a power management module with light module identification.</li><li><figref idref="f0029">Fig. 28</figref> depicts a replaceable power management module with auto-configuration.</li><li><figref idref="f0030">Fig. 29</figref> depicts a rotatable light module with cross-cut heatsink.</li><li><figref idref="f0031">Fig. 30</figref> depicts a thermal design for surface-mount fixture.</li><li><figref idref="f0032">Fig. 31</figref> depicts a thermal design for pole-mount fixture.</li><li><figref idref="f0033">Fig. 32</figref> depicts a thermal design featuring evaporative cooling.</li><li><figref idref="f0034">Fig. 33</figref> depicts a fixture with waste heat harvesting.</li><li><figref idref="f0035">Fig. 34</figref> depicts a thermal design for a lighting fixture featuring passive electrostatic cooling.</li><li><figref idref="f0036">Figs. 35A</figref>, B, &amp; C depict variations of a fixture aiming apparatus.</li><li><figref idref="f0037">Fig. 36</figref> depicts cooperative sensor networking.</li><li><figref idref="f0038">Fig. 37</figref> depicts automated commissioning via a mesh network.</li><li><figref idref="f0039">Fig. 38</figref> depicts automated commissioning via neighbor detection.</li><li><figref idref="f0040">Fig. 39</figref> depicts automated commissioning via an interactive procedure.</li><li><figref idref="f0041">Fig. 40</figref> depicts cooperative failure compensation.</li><li><figref idref="f0042">Fig. 41</figref> depicts TIR optics.</li><li><figref idref="f0043">Fig. 42</figref> depicts TIR plus holographic optics.</li><li><figref idref="f0044">Fig. 43</figref> depicts a quarter-turn mechanism for holding optics.</li></ul>

DETAILED DESCRIPTION OF THE INVENTION

0076While the specification concludes with the claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the drawings/figures, in which like reference numerals are carried forward.

0077As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting but rather to provide an understandable description of the invention.

0078The terms "a" or "an", as used herein, are defined as one or more than one. The term "another", as used herein, is defined as at least a second or more. The terms "including" and/or "having" as used herein, are defined as comprising (i.e. open transition). The term "coupled" or "operatively coupled" as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically.

0079<figref idref="f0001 f0002">Fig. 1</figref> depicts an exemplary environment 100 where various embodiments of the present invention may be practiced and realized. Examples of the environment 100 may include a warehouse, a manufacturing facility, a parking garage, a parking lot, a street, a prison, indoor pools, a gymnasium, a dormitory, a stadium, an arena, a retail house, a bridge, a tunnel, clean rooms, and some other types of similar environments and facilities.

0080Referring to <figref idref="f0001">Fig. 1a</figref>, the environment 100 may include lighting systems 102. The lighting systems 102 may include various lighting fixtures. A lighting fixture is a device for providing artificial light or illumination. A single lighting fixture unit may include a light source(s), power source, a reflector, a lens, outer shell (i.e., an enclosure) and other elements. In embodiments, various sub-components may be combined to create a family of lighting fixtures 102. The lighting systems 102 may further include various modules for managing power, light, and thermal requirements of the lighting systems 102 within the environment 100. The lighting systems 102 may also include communication systems such that data can be sent to the lighting systems 102 to control them and data can be sent from the lighting system 102 to provide information to a central system for management of the artificial lighting in the environment 100.

0081<figref idref="f0001">Fig. 1a</figref> illustrates three lighting systems, 102a, 102b, and 102c. However, those skilled in the art would appreciate that in an alternate embodiment, the lighting system may include one or more lighting systems such as 102d and 102e (not shown in <figref idref="f0001">Fig 1a</figref>). Lighting system 102a utilizes Light Emitting Diodes (LEDs) and/or Organic Light Emitting Diodes (OLED) 104 as the primary light source. Similarly, lighting system 102b utilizes non-LED based lights as the primary light source. Examples of non-LED based lighting fixture utilizing non-LED light sources 108 may include any conventional type of lighting fixtures such as fuel lamp, high intensity discharge (HID) lamp, arc lamp, incandescent lamp, halogen based lamp, gas-discharge based lamp, fluorescent, compact fluorescent lamp, cathode based lamp, fiber optics based lamp, induction, microwave lamp, RF lamp, electrode less discharge lamp, nuclear power based lamp, and the like. Lighting system 102c may be a combination of lighting system 102a and 102b and may include lighting fixtures that may use both LED based light sources and non-LED light sources.

0082Each of the lighting fixtures may include an optical component(s) such as a lens, primary optic, secondary optic, or the like. The lens may be an etched, Fresnel, Plano-convex, condenser, objective, and some other type of lens to be used in the lighting systems to alter or shape the beam of light emitted from the lighting system. In other embodiments, the lens may be a flat, clear plate that is meant more as a way of keeping the inside of the lighting system clean. One skilled in the art would appreciate that there are many lens types that could be used in such a lighting system. In an aspect of the present invention, a "secondary" or "tertiary" optic assembly, which may be user-replaceable, may be disclosed. For example, in an LED based lighting fixture 104, the optic lens may be replaced by the user without the use of a tool. Further, some means for re-establishing the environmental seal around this fixture optic assembly may also be provided. Allowing the end-user (e.g. an electrical contractor) to swap optics on-site easily may provide maximum system design flexibility, while limiting the number of design variations required to be held in stock.

0083In embodiments, LED based lighting fixture 104 with variable luminous efficacy may also be provided. The luminous efficacy of an LED (and, by extension, of an LED based lighting system 102a) may vary across its operating current. For many LED devices, the peak operating efficacy may occur at a level well below the rated maximum current of the device. In an aspect of the present invention, an LED based lighting fixture 104 with at least two operating states: a lower-lumen, higher efficiency state; and a higher-lumen, lower efficiency state, and a means for the user to select which operating state is active may be provided. There may be more than two discrete operating states. In an embodiment, there may be a continuum of operating states between "high-efficacy, low-lumen" at one extreme and "low-efficacy, high-lumen" at the other extreme. A user may select the operating state in a variety of ways such as manual control attached to (or integrated) into the fixture, manual control mounted as a light switch, networked (wired) control, wireless control, and some other ways. The choice of operating state may be implemented within the fixture "ballast" in a variety of ways. For "manual" control, the ballast may contain a momentary or ON/OFF switch input. When the input is closed, the ballast may drive the LED devices to one operating state. Similarly, when the input is open, the ballast may drive the devices to the other operating states. For "manual" control, the ballast may contain a proportional voltage or current input, which may be connected to a device such as a potentiometer for user selection of state. For networked (wired) or wireless control, the ballast may contain a microprocessor or intelligent control device combined with a serial network. In an embodiment, for networked (e.g., wired or wireless) control, the ballast may contain a microprocessor or intelligent control device combined with a parallel network.

0084In another embodiment, for networked (e.g., wired or wireless) control, the ballast may contain a microprocessor or intelligent control device combined with a set of one or more digital input lines that may be mapped to various operating states. Further, for networked control, the ballast may also contain a microprocessor or intelligent control device combined with an analog input that may be mapped to the various operating states.

0085In an aspect of the present invention, an LED multi-head lighting system may be disclosed. In retrofit applications, the amount of re-wiring that must occur (resulting in added expense) may be limited. Conventionally, the high-voltage wiring may pose a problem due to electrical code constraints. For example, when the wiring must be run inside conduit or protected in some way, it poses a problem because high voltage wiring may be typically difficult to install.

0086The lighting systems 102 may include management modules such as a power management module 112, a thermal management module 114, and a light management module 118. The power management module 112 may be a module that regulates the power delivered to the lighting system 102, including power delivered to the light source(s) within the lighting system 102. The thermal management module 114 may be a module that regulates the thermal aspects of the lighting system 102. For example, the thermal management module 114 may include active and passive cooling components. The light management module 118 may regulate aspects of the light source(s) in the lighting systems 102. For example, the lighting management module 118 may regulate the intensity, color temperature, beam angle, lens control, or other aspects of the light sources or light production.

0087The lighting systems 102 may also include operational modules such as an electrical module 174, mechanical module 178, and some other types of modules. The electrical module 174 may be associated with electrical packaging and accessories such as electrical connectors, circuits, conductors, wirings, routings, switches, junctions, electrical panels, and some other types of electrical accessories for the lighting systems 102. The electrical module 174 may also be associated with the management of the electrical components and accessories in the lighting systems 102.

0088In an aspect of the present invention, the electrical module 174 may be a modular power connector system that may support many types of existing power wiring and connector types. For example, the LED based lighting fixture 104 may contain a "wiring compartment" such as an electrical module 174 into which cabling carrying power may be connected. One face of this module may carry a bulkhead-mounted connector socket, and the face may be removable and replaceable to provide a large range of potential connector sockets to match existing conditions.

0089The mechanical module 178 may be associated with packaging and support frameworks such as chassis, housings, outlets, mechanicals connectors, plug connections, and some other type of mechanical elements for the lighting systems 102. In other embodiments, the mechanical module 178 may also be associated with the management of the mechanical components and accessories for lighting systems 102. Both the mechanical and electrical modules 178 and 174 may be modular in nature to facilitate interconnectivity between parts within and between each such module.

0090The mechanical module may include a lens cleaning system or a system to help in keeping the lens clean. For example, the lighting system 102, including the lens and/or other components such as the outer casing or inner parts, may be electrostatically charged to repulse dust from the lens and any exposed optical surfaces or other surfaces. Other surfaces may be charged such that the appearance of the fixture remains clean, while the lens may be charged to help in keeping light levels high and the lumen maintenance of the fixture over a period is improved. In another embodiment, a lighting system may include a glass lens or plastic lens and the surface of the lens may be coated with Titanium Dioxide. The Titanium Dioxide would be exposed to Ultra Violet (UV) rays in order to decompose the dust and make the surface photo-catalytic. The UV may be from external sources, including daylight. In embodiments, one or more UV sources (e.g., a UV LED, an HID lamp) may be placed within the lighting system 102. When the objective is to keep the outer surface of the lens clean, the glass or plastic lens may be transparent in the desired spectrum of the UV such that the UV passes from the UV light source in the fixture to the dust on the outer surface of the glass. In embodiments, the whole lighting system or the entire lens assembly may be sprayed with the Titanium Dioxide. In yet other embodiments, a nano-texturing process is applied to the lens to prevent dust from sticking to it. In yet other embodiments, the lens, or other parts of the lighting fixture 102, may be ultrasonically vibrated to prevent dust build up.

0091The power management module 112 controls and manages the power utilized by the lighting fixtures 102. This may include management of the voltage and current associated with the lighting fixtures 102. In embodiments, the power management module 112 may manage power by controlling voltage using a triode, a voltage regulator, and some other types of voltage control device. In another embodiment, the power management module 112 may control the current using a resistor and some other types of current controlling devices.

0092In embodiments, the power management module 112 may also manage the total illumination, operating voltage, power supply ratings, and the forward current requirements in the fixtures. A lumen is a measure of perceived power of light. Conventionally, it is known that the intensity of light emitted by the lighting fixtures tends to fall over time. This effect is termed as 'lumen maintenance.' In some instances, the power management module may also be concerned with 'lumen maintenance' of the lighting fixtures by regulating power to the lighting fixture 102 (e.g. in response to sensor feedback in the environment).

0093In embodiments, power management devices such as pumps, drivers, regulators, controllers, supervisors, and references (a voltage reference) may be used for controlling power in the lighting systems 102. Thereby, the power management module 112 may also be involved in management of these power devices. In embodiments, the power management module 112 powers one or more sensors.

0094Conventional lighting systems as well as LED based lighting systems may reflect decrease in performance due to generation of ambient heat. The thermal management module 114 in the lighting systems 102 may manage and control the thermal properties of the lighting fixtures. The thermal management module 114 may provide hardware such as heat sinks, cooling mechanisms (fans, jet air, and liquids), heat pipes, thermo-siphons, and adhesive based materials for dissipation of heat.

0095In embodiments, the heat sink may be provided as an outside enclosure. The outside enclosure in this case, may act both a protective covering as well as heat sink. In embodiments, the heat sink may be made of aluminum or some other metal known in the art.

0096For example, in a non-LED based lighting fixture 108 such as a 1000-watt incandescent lamp, heat may be generated due to high intensity beam of infrared rays. In such an instant, the sensor 120 associated with the thermal management module 114 may instantly sense the increase in temperature level and may initiate or trigger a heat dissipation mechanism such as opening of ventilation holes in the lamp housing or initiating fans or other cooling mechanisms in the enclosure.

0097Usability of LED based lighting fixtures 104 may also be determined by a maximum ambient temperature. This is the maximum temperature at which the LEDs may be used, and this may be dependent on a PN junction temperature (Tj) and thereby on a maximum PN junction temperature (Tj max). In an embodiment, the thermal management module 114 may measure and control the maximum temperature. For example, if the maximum temperature for the LED based lighting fixture 104 is more than a predetermined value, the thermal management module 114 may lower the intensity of the lighting fixtures and consequently reduce the power consumption. In embodiments, the thermal management module 114 may continuously measure the temperature associated with the LED based lighting fixture 104.

0098The light management module 118 may regulate power and control signals, specifically for the LED based lighting fixtures 104 in <figref idref="f0001">Fig. 1(a)</figref>. In embodiments, the light management module 118 may manage and control various beam angles of lighting fixtures. A beam angle is the area where the lighting fixture illuminates the brightest. A family of lighting fixtures may have different beam angles such as potentially asymmetric beam angles. <figref idref="f0001">Fig. 1a</figref> illustrates various beam angle lines 130 (narrow and far) for each of the lighting fixtures: 104, 108, and 110. The light management module may receive feedback from an internal module, such as the power management module 112 or the thermal management module 114, or an external module, such as the management systems 134, and respond to the feedback by altering the lighting produced by the light source in the lighting system 102.

0099Conventionally, in retrofit lighting applications, a huge variation in fixture mounting height, spacing, beam pattern and angles, and light levels may make a one-size-fits-all approach to a fixture design impossible. In an aspect of the present invention, a modular design of a LED based lighting fixture 104 including light strips of various beam angles may be provided. This design may facilitate in emulating performance of a large number of fixtures, starting from a relatively small number of fixture building blocks.

0100In an embodiment, the modular design of an LED based lighting fixture 104 may include various composite beam patterns. These patterns may be created by combining smaller sub-fixtures. This may eventually facilitate in achieving required minimum foot-candle levels using lower total fixture lumens.

0101In an aspect of the present invention, the modular LED based lighting fixture 104 may also include a frame and a family of light strips mounted onto this frame. The frame may be modular in design. For example, the frame may be designed such that it may be rotated. In another example, the frame may be provided with additional mounting features such as a plug-and-play feature.

0102In an aspect of the present invention, the modular LED based lighting fixture 104 may include light strips that may be individually rotated within the frame for obtaining a specific direction of light from each strip. This facilitates in providing maximum flexibility to the resulting foot-candle pattern. For example, <figref idref="f0018">Figs. 17A and 17B</figref> depict a fixture 1704 with at least one rotatable light bar 1702. At least one light bar 1702 can be individually rotated to change the fixture's beam pattern. The LED light bars may be arranged to rotate along at least one rotational axis independent of the orientation of the housing. Rotation of the light bar may be used to change the aggregate beam angle of light emitted from the lighting fixture when the angle of rotation is substantially changed. Throughout this specification, at least one of the plurality of LED light bars of the LED lighting fixture 104 may optionally include a rotational drive constructed and arranged to rotate the at least one LED light bar along at least one rotational axis independent of the orientation of the housing, or the LED light bar may be freely rotatable.

0103In another aspect of the present invention, the modular design may include a preset rotation angle that may fix the position of the light strips based on the type of application. For example, lighting fixtures for an "architectural" lamp may require setting of the light strips at a specific angle.

0104The light strips may be linear, rotund, or in some other shape. Upon illumination, each of the mounted family of light strips may create a region of illumination that may be either overlapping or non-overlapping. Further, the family of light strips may have different beam angles (potentially asymmetric) and levels of brightness. Some strips may be outdoor-rated, or have varying IP ratings. Electrically, the light strips may have built-in power conversion so that AC may be wired strip-to-strip. In other embodiments, the light strips may have a central power conversion module mounted to the frame, with distribution of power to each strip. Furthermore, each of the family of light strips may be associated with a sensor. The types of sensors that may be employed and the co-ordination of each lighting fixtures with these sensors is explained in detail below.

0105In an aspect of the present invention, modular lighting systems 102 may be provided wherein only a portion of the lighting fixtures may be powered to decrease the overall power consumption of the system. To accomplish this, the lighting fixtures may be designed to control the beam angle of the light emitted from them. For example, in a warehouse facility, the lighting system may be designed to power a narrow beam strip for traffic guidance or a side directed beam for shelf locations. The modular lighting systems 102 described above may provide ability to individually turn individual light strips 'ON' and 'OFF inside the fixture in order to provide foot-candles precisely where and when needed. In a simple incarnation, this may be represented by a modular fixture such as an LED based lighting fixture 104, with two light strips, say "A" and "B" (not shown in the figure), and the sensor 120 that may determine whether activity is occurring in the areas illuminated by "A" and "B". This sensor 120, when combined with a simple control system, may turn each individual light strip 'ON' only when needed, reducing the overall power consumption of the system. In another embodiment, each LED in the lighting fixtures may be individually controlled, giving maximal resolution of control.

0106Each lighting system 102 may also include a sensor 120, as shown in <figref idref="f0001">Fig. 1(a)</figref>, for managing and controlling power and light requirements and controlling the thermal properties of the lighting fixtures. The information or data produced by the sensors may be fed directly back into the lighting management module 118 such that the information can be acted on locally. For example, if the sensor is an ambient light sensor and it detects that the light has fallen to a certain level, an indication of the level may be fed back into the lighting management module 118 for processing. The lighting management module may calculate that the light level is not acceptable and as a result cause a change in the light emitted from the lighting system 102 (e.g. changing intensity, color temperature, beam angle, etc.). In other embodiments, the information from the sensor may be fed back to the management systems 134 through a data communication network for central processing. Then the management systems 134 (e.g. the lighting management module 148) may further regulate the lighting systems 102 based on the sensor feedback by sending instructions back over the data communication network.

0107In an embodiment, the sensor 120 may be a remote sensor, such as radiometer, photometer, spectrometer, light sensor, motion sensor, etc. In such a scenario, the remote sensor 120 may be placed at a location distant from the lighting systems 102 or may be associated with the lighting systems 102, or the management systems 134, in a remote or wireless way. The sensor 120 may then utilize radiations to sense objects or lighting conditions in the environment 100 and in turn control the lighting fixtures.

0108In an embodiment, the lighting fixtures may directly coordinate and interface with sensors for local control. The lighting fixtures may be providing information to the sensors for local control or vice versa, as shown in <figref idref="f0001">Fig. 1a</figref>. For example, in lighting system 102a, the sensor 120 may detect a sudden increase in ambient temperature inside the LED based lighting fixture 104. Upon detection, the sensor 120 may send a signal or alert to the thermal management module 114 in the lighting systems 102, to dissipate the heat from the enclosure of the LED based lighting fixture 104. Subsequently, the thermal properties inside the lighting system 102a may be effectively managed and may be kept under check.

0109In another embodiment, the sensor 120 may send sensed or detected information to a central intelligence control that may be responsible for the overall lighting management of the environment 100. The central control may utilize information from sensor 120 and various other modules and sub-modules such as those for demand response, building management, power storage management, and some other types of modules to regulate and control the functioning of the lighting systems 102.

0110Examples of sensor 120 may include a motion sensor, occupancy sensor (infrared (IR), passive infrared (PIR), ultrasonic, etc.), thermal sensor, an electromagnetic sensor, a mechanical sensor, a chemical sensor, an optical radiation sensor, an ionizing radiation sensor, an acoustic sensor, a biological sensor, a geodetic sensor, electrical current, voltage, power sensor, ambient light sensor, force sensor (strain gauge), humidity sensor, air quality sensor (CO, pollutants, etc.), payments (EZPass, etc.), video (security camera, etc.), audio (microphone, etc.), RFID reader, limit switches, hall-effect sensors, and the like. A thermal sensor may be a temperature sensor such as thermometers, thermocouples, thermistors, thermostats, and heat sensors such as bolometer, calorimeter, or a heat flux sensor.

0111Examples of electromagnetic sensors may include electrical resistance sensors, current sensors, voltage sensors, power sensors, magnetic sensors, metal detectors, or RADAR. Similarly, mechanical sensors may be pressure sensors; flow sensors; humidity, density, and viscosity sensors; position sensors; acceleration sensors, and the like. Chemical sensors may include odor sensors, oxygen or carbon monoxide detectors, ion selective or redox electrodes, and some other types of chemical sensors.

0112Examples of light sensors may include photo-detectors, infrared sensors, proximity sensors, scanning laser, fiber optic sensors, and some other type of sensors. Examples of acoustic sensors may include SONAR, Ultrasound, and some other types of acoustic sensors.

0113In embodiments, the sensor 120 may be associated with the objects in the environment 100. The objects may be moving or stationary in nature. Moving objects 122 may be people, vehicles, and the like. Similarly, stationary objects 124 may be racks, a dead-end wall, containers, stairs, a light pole, and some other types of stationary objects. Sensors may be installed on the moving objects 122 and/or stationary objects 124 for managing lighting in the environment 100.

0114For example, a proximity sensor may be installed over a freight kept in the center of a poorly lit warehouse. In case a person or object (such as a vehicle) approaches this freight, the proximity sensor may detect the presence of this person or the object and may send this information to the central control system that can subsequently initiate an action to deflect collision. An appropriate action may be, lighting the path of the person/object or lighting up the freight area or raising an alarm and some other type of action that may facilitate in preventing the collision. In other embodiments, sensor 120 may also be installed on other objects of the environment 100 such as walls, floorings, ceilings, corners, parking ticket booths, and the like. In an aspect of the present invention, sensors on the people or vehicles of a warehouse to track their presence and then intelligently manage the lighting in the warehouse in accordance therewith may be provided.

0115Most intelligent lighting systems may rely on relatively low-tech occupancy or ambient light sensors. These are not always a perfect solution as environmental conditions (such as high ceilings) can make their operation ineffective. As an alternative, passive "tags" may be attached to people and vehicles in a facility, enabling the lighting system to sense their position. Based on the sensed positions, higher-resolution position maps may be built for internal purposes.

0116In an embodiment, a passive tag/transceiver such as a passive RFID or an active tag such as an EZPass may be attached to people and/or vehicles in a facility. Further, compatible transceiver sensors may be attached to the lighting network. The transceiver location information may be used to build an internal representation of the locations of each person and vehicle at each point in time, and set light levels accordingly.

0117In an embodiment with sufficient temporal and spatial resolution, the control system may track velocity and/or acceleration, if useful for each person and vehicle, and use this information to warn of potential collisions.

0118In another embodiment, the higher-resolution usage data may be exported to other systems. Further, this higher-resolution information, when used in a parking garage application, may facilitate the type of intelligent parking system described above.

0119In another embodiment, the sensors may also be installed on people or vehicles outside the warehouse. For example, a truck coming from St. Louis to Chicago to pickup an order may have a sensor installed on it. When the truck is 5 miles (8.047 kilometers) away from Chicago, the forklift may be automatically coordinated through the computer to ready the order, and the truck may be assigned a spot based on the previously assigned unloading area in the warehouse. This may result in a better system for just-in-time (JIT) inventory management. Lighting systems disclosed throughout the application herein may be used as guidance in such a management system.

0120The sensors 120 in the environment 100 may derive power supply scavenged from luminaires in the system. Alternately, the power may be derived through a bus from a management system or a gateway. In other cases, power source may be a separate wall wart (e.g., power brick, plug pack, plug-in adapter, adapter block, domestic mains adapter, power adapter, or AC adapter.) Still further, the power source may be an integrated power supply.

0121Similar to the lighting systems and management systems, the sensors 120 may be in a network. The network may be either wired or wireless. The wired network may include powerline carrier (Echelon, X10, etc.), Ethemet/IP, Serial (RS-232, RS-485), lighting specific (DMX, DALI, etc.), and proprietary (BacNET, LON, etc.)

0122Similarly, the wireless network may be a mesh network (Zigbee, Zwave, Ember, Millennial, etc.) or open standard (802.11 etc.)

0123Referring again to <figref idref="f0001">Fig. 1a</figref>, the environment 100 may also include a day-lighting structure 132. Day-lighting is a practice of placing structures and surfaces in a region so that effective internal illumination may be provided by natural light during the day to facilitate optimization of power and energy. The day-lighting structure 132 may be provided at the top of the environment 100 such as the top of a warehouse building or maintenance facility, through the window on the side of a structure, or openings in a structure like the sides of a parking garage. Examples of day-lighting structure 132 may include windows, light reflectors, light shelves, skylights, light tubes, clerestory windows, saw-tooth roof, and some other types of day-lighting structures. In another aspect of the present invention, the day-lighting structure may be an absence of a wall, portion of a roof, and some other type of openings and vents in the environment 100.

0124Through sensors 120 in the environment 100, the effectiveness of day-lighting may be observed and the artificial lighting in the environment 100 may be altered in response thereto. As indicated elsewhere herein, the sensors 120 may provide feedback directly to a lighting system 102 and/or the sensor feedback may be sent to the management systems 134 for processing. In either situation, the sensor feedback may be used to regulate the lighting systems 102 in the environment 100 in response to day-lighting. For example, the day-lighting may be observed through one or more sensors 120 in the environment 100 and the sensors 120 may then send data to the lighting management module 148 for processing. The lighting management module 148 may then process the information to check for compliance with pre-established acceptable lighting conditions and regulate the lighting system(s) 102 in accordance with the evaluation. In embodiments, as will be described in detail below, available energy and energy pricing information may also be provided to the lighting management module 148 and these factors may be incorporated into the overall equation for altering the lighting systems 102 in response to observed day-lighting conditions.

0125In embodiments, the lighting systems 102 may also include a power source for sensor 120 or the lighting fixtures. In embodiments, the power source may be a conventional power source such as Alternating Current (AC) or Direct Current (DC) (power from the grid), batteries, generators, and some other types of conventional power sources.

0126In embodiments, the power source may be an alternate energy source (AES) 128. Information regarding the external power available in the form of either alternative energy through AES 128 or energy obtained from UES 180 and relative cost of grid based and externally provided power may be utilized by the management systems to intelligently utilize power. The management systems 134 may control AES 128 to regulate the lighting system 102. For example, AES 128 may be a solar power. The solar power may be derived from solar photovoltaic panels, solar thermal systems, and/or solar concentrator systems. This power may be used to charge a plurality of batteries in the energy storage facility 184. The stored energy may be managed by the demand response module 144, which may utilize the stored energy as an alternative to the conventional power. In one example, the demand response module 144 may determine that additional power may be required for maintaining lighting, and in response, it may provide only partial electric supply from AES 128. In another example, full operational power to the lighting system 102 may be provided by the demand response module 144 from AES 128. In yet another example, the lighting prediction and management module 152 may forecast the need for additional power at mid-night, say 1:00 AM. This information may in turn be provided to the demand response module 144 which may query demand response rules database 154 and/or third party rules database 158 to determine the compliance regulations. If the compliance to the rules is established by the respective databases, the demand response module 144 may switch 'ON' AES 128 for additional power. For illustrative purposes, the examples of AES 128 may include solar, wind, hydroelectric, fuel cells, Reformed Methanol Fuel Cell (RMFC), Ocean Thermal Energy Conversion (OTEC), kinetic energy, piezoelectric, pyro-electric, thermoelectric, electrostatic, capacitive, tidal, salinity gradient, and some other types of alternate energy source. In an embodiment, AES 128 may be a generator such as an electric-generator or an engine-generator.

0127Similar to AES 128, the power source providing energy to the lighting systems may also or alternatively be a utility energy source (UES) 180. Example of a UES 180 may be a central station such as a power station from where external energy may be delivered to the lighting systems 102 in the environment 100.

0128In another embodiment, energy from AES 128 and UES 180 may be routed to an energy storage facility 184. Examples of the energy storage facility 184 may be batteries, fuel cells, flywheels, ultra-capacitors, capacitors, mechanical energy storage devices, superconducting magnetic energy storage, compressed air energy storage, hydraulic accumulator, cryogenic liquid air, thermal stores, steam accumulator, and some other types of energy storage facilities.

0129In an aspect of the present invention, energy or power harvesting techniques may be utilized to capture and store alternate energy. Energy harvesting information from AES 128 may be directed to management systems 134. The management systems 134 may further utilize this information for managing power demands and energy requirements within the environment 100. In other embodiments, the energy harvesting information may be sensed by sensor 120. The sensor 120 may read this information and direct it to the central control such as management systems 134 or the local control within the lighting systems 102; thereby the lights may be managed and controlled locally within the environment 100. The utilization and control of the alternate energy, utility energy, and harvested energy and their management by the management systems 134 has been explained in detail below.

0130AES 128 and UES 180 may provide or feed information to the central management systems such as management systems 134, as depicted in <figref idref="f0002">Fig. 1b</figref>, regarding the energy that may be generated in each of the energy sources or stored in the energy storage facility. The information feed from AES 128 may be further utilized by the management systems 134 to manage and control the lighting systems 102. Also, AES 128 may provide information to the management systems 134, regarding the amount of power stored and/or that may be available in the energy storage facility 184. The information feed from AES 128 may be directed to a sub-module of the management systems 134 such as an energy demand response module 144, regarding the amount of power that may be collected or may be available in the storage battery. For example, when an increase in energy demand in the environment 100 is reported by sensors 120 to the energy demand response module 144. The demand response module 144 may instantly act upon this information and combine it with the information regarding the alternate energy available in the storage facility. Subsequently, it may switch over the power sources in the lighting systems 102 from conventional (e.g. UES) to alternate power sources. This may lead to induction of an efficacious and responsive system for managing the increased power demand in the environment 100.

0131The information feed from AES 128, UES 180, and energy storage facility 184 may be utilized by the various sub-modules of the management systems 134 for initiating various control and management actions. For example, there may be an internal administration rule that energy utilization during any time of the day should not cross a mark of 4KW/hr. In case the energy utilization is more than the marked value, the demand response module 144 may initiate an alarm or warning signal for the administrator to switch over power supply from the UES 180 sources to AES 128. Similar to the internal administrator, third parties may also utilize information feed from AES 128, UES 180, and stored and harvested energy in energy storage facility 184. For example, during night the storage batteries will be fully charged. Therefore, the third party may switch the power sources from conventional to AES 128 to optimize energy usage. It may be noted that switching of the power sources may also be based on certain third party rules set forth in the mutual agreement between the third party and the administration and stored in third party rules database 158. In some cases, the government (or energy from UES 180) may also provide energy at subsidized rates say at 40 percent lower than the normal rates. This energy may also be stored in energy storage facility 184 or various storage devices such as batteries, flywheel, ultra-capacitors and the like and may be subsequently utilized when peak hour energy demand triggers response from the demand response module 144. In addition to the above, the demand response module 144 may utilize information regarding the rise in cost of energy procured outside the building through web, or other sources and combine this information with the energy information from AES 128, UES 180, and energy storage facility 184 to determine the most effective energy source (between the conventional or alternate) for powering the lighting systems 102 in the environment 100. For example, in case the energy demands are high and external operating costs rise for the lighting systems 102, the demand response rules database 154 may direct the lighting management module 148 to check the alternate energy storage. Alternately, the demand response rules database 154 may direct the lighting management module 148 to turn the lights 'OFF' or fade away (dim the lights).

0132Similar to the demand response module 144, lighting and prediction and management module 152 in the management systems 134 may utilize weather forecast information, analyze the energy information from AES 128, UES 180 and energy storage facility 184; and estimate the amount of energy that may be generated over a period.

0133In an embodiment, energy from the AES 128 and UES 180 may be delivered to the lighting fixtures in the environment 100 via a control panel 182. The control panel 182 may be responsible for managing the flow of energy between the energy sources and the lighting fixtures. In an aspect of the present invention, the control panel 182 may be managed and controlled by the management systems 134. For example, the management systems 134 may command switching 'ON/OFF' for the control panel 182. The description and/or functioning of various sub-modules of management systems 134 and other exemplary elements of the present invention have been explained in conjunction with <figref idref="f0002">Fig. 1b</figref> below.

0134<figref idref="f0002">Fig. 1b</figref> depicts other exemplary elements of the present invention. These elements may include central control systems or management systems 134 (as depicted in the figure), user interface 138, and energy demand information module 140. In an aspect of the present invention, the elements of the present invention may be connected by a controlling network 142 that may be a wired network such as an Ethernet. In another aspect of the present invention, the elements of the present invention may be connected by the controlling network 142 that may be a wireless network such as Wireless Local Area Network (WLAN), Wireless Personal Area Network (WPAN), Wireless Metropolitan Area Network (WMAN), mobile devices network, and some other type of wireless networks. In embodiments, the elements of the network 142 may be connected in various topologies such as bus, star, tree, linear, ring, mesh, hyper, and some other types of network topologies. In an aspect of the present invention, the controlling network 142 may be a mesh network.

0135In an aspect of the present invention, combining LED based lighting fixtures 104 with intelligent wireless sensing and control may enable new applications. In an embodiment, the applications may be related to high bay fixtures used in the warehouse. In accordance with the above ideas, a lighting system may be designed to integrate LED illumination modules with intelligent sensing of various types and a wireless control network to transmit sensing and command data between the fixtures, sensors, control points (such as switches), and monitoring points (such as a facility manager's desktop computer) specific to warehousing applications.

0136Examples of applications may include fork truck traffic guidance, intelligent guidance based on projection of pathway to be used, integration with other warehouse management systems, zone control, zone control based on sensor input, zone control based on warehouse management systems input, and some other types of applications.

0137In accordance with another embodiment for LED based lighting fixtures 104 with intelligent wireless sensing and control, the lighting fixtures may also be used to provide a warning signal regarding potentially hazardous conditions, so that persons or vehicles in that area may stay clear. For example, lighting fixtures located at the end of a narrow aisle (with poor sight lines down the aisle) may blink to indicate the presence of a fork truck in that aisle.

0138In another embodiment, the lighting fixtures may be used to guide the fork truck operators to their destination inside a warehouse. For example, each lighting fixture may contain an integrated fork truck sensor 120 and the wireless network to report the truck's position back to the management systems 134. The management systems 134 may take input from an existing Warehouse Management systems (WMS) to specify the destination of each truck. This destination information may be used by the management systems 134 to calculate optimal routes through the warehouse for each truck and to determine the lighting fixtures that line each route. The management systems 134 may then issue commands back to the lighting fixtures along each route to cause the lighting fixtures to indicate the proper route to the fork truck driver. This may be indicated, for example, by blinking of the main light or attaching a low-power indicator light (for instance, a small green LED light) to the main fixture, and blinking of the indicator light.

0139In yet other embodiment, "smart fork truck" control systems may be integrated into the lighting fixtures for automated control.

0140In another embodiment, the management systems 134 may allow the operator to define "zones" of lighting such as "stacks" zone, "active work" zone, "loading" zone, and so forth. Each zone then gets a unique lighting policy to minimize overall energy consumption.

0141Similar to the warehouse, in an embodiment, combining LED based lighting fixtures 104 with intelligent wireless sensing and control may enable new applications for a manufacturing facility. In accordance with this idea, a lighting system may be designed to integrate LED illumination modules with intelligent sensing and the wireless control network to transmit sensing and command data between the lighting fixtures, sensors (sensor 120), control points (such as switches), and monitoring points (such as a facility manager's desktop computer) specific to manufacturing applications. This may be explained in conjunction with the various embodiments that follow.

0142In an embodiment, a toxic vapor sensor 120 may be integrated into each lighting fixture. Further, the wireless network may be used to relay any alarming events back to the management systems 134 and blink the light (or turn on a smaller indicator light) if the sensor 120 is triggered.

0143In another embodiment, RFID sensors in each lighting fixture combine with the wireless data collection network to provide real-time material tracking inside a manufacturing facility.

0144In other embodiments, a "Zone" lighting system with the wireless network and equipped with sensor 120 specific to the manufacturing facility may be provided.

0145In another aspect of the present invention, the wireless control of parking garage lighting fixtures for the applications related to intelligent lighting management of the parking garage may be provided. Examples of such applications include parking spot identification, parking spot guidance, safety illumination, daylight harvesting, and ingress and egress of pedestrians tracked to manage light level while always maintaining safety level. Combining LED based lighting fixtures 104 with intelligent wireless sensing and control may enable new applications in the parking garage market.

0146The present invention relates to a lighting system that may integrate LED based lighting systems 104 with intelligent sensing of various types and a wireless control network to transmit sensing and command data between the fixtures, sensors, control points (such as switches), and monitoring points (such as a facility manager's desktop computer) specific to parking garage applications.

0147In an embodiment, an ambient light sensor 120 may be integrated into each parking garage fixture, thereby, reducing the light output of each fixture based on the amount of ambient daylight illumination available.

0148In another embodiment, an occupancy or motion sensor 120 may be integrated into each parking garage fixture. For example, when the surveyed region is empty, the light levels may be reduced to approved minimums settled by Illuminating Engineering Society (IES), and when a person or vehicle is present, the light levels may be increased to maximum in order to improve perceived safety.

0149In other embodiments, lights may be linked together in the wireless network so that regions (e.g., an entire floor) dim and brighten together to eliminate dark spots. Further, the lights may be linked together wirelessly, and occupancy data may be transmitted to a remote location (or log to local database) for safety auditing purposes.

0150In an embodiment, the lights may be varied linearly (and not just high or low).

0151In other embodiments, a proximity or distance sensor 120 may be used instead of occupancy sensor 120, so that illumination may be brightest when a person or vehicle is directly below the fixture.

0152In yet other embodiments, a heat sensor may sense body heat and indicate the path via blinking lights or illuminating indicator attached to the main light in order to increase safety.

0153In an embodiment, cell phone identification of parking spot location may be also integrated with light management of the parking garage. Sensor 120 capable of identifying the unique signature of a cell phone may be integrated into the lighting fixtures. When a person parks, his/her phone may be registered against the database of parking spaces. Upon returning to the parking, the lighting system may guide the person back to the parked space.

0154In another aspect, the parking space may be determined by RFID embedded in a parking ticket. In yet other aspect, the parking space may be determined by tracking EZpass-type transceiver.

0155In an embodiment, a carbon monoxide sensor 120 may be integrated into the lighting systems 102 with wireless network linking sensor 120 to a ventilation system.

0156In an embodiment, users may be allowed to reserve parking spots in advance via cell phone, web, and other such reserving or booking means. Therefore, users with reserved parking spots may be guided to the assigned spot with the help of the lighting systems 102. In addition, the assigned spots may be marked with red or green colored lighting to indicate to other users that the parking space is already reserved.

0157In another embodiment, the nearest available free spots may be shown on GPS before entering the garage through lighting systems 102 and garage management systems 134 (Garage to GPS) communication. This information may let a person know the first available spot on the sixth floor or may disclose the number of spots that may still be available. In case of full occupancy, GPS may also route the person to different garages in the vicinity.

0158In an aspect of the present invention, a sensor input for identifying and tracking parking spaces and communicating the same to cell phones (e.g., based on flight schedules, based on a registered cell phone viz., registered at the Burlington mall garage) may be provided. Conventionally, the deployed intelligent parking garage systems may be expensive to retrofit into existing facilities. For example, $400-500 per space of parking may be required to park in a mall. In such a scenario, LED based lighting fixtures 104 (with integral wireless control and sensing) may be used as a 'Trojan horse' to facilitate lower-cost system implementation in retrofit cases.

0159In an embodiment, parking space information may be sent to a user's cell phone (via SMS/email/etc) to help the user return to his/her vehicle.

0160In another embodiment, the cell phone may be automatically identified via Bluetooth, or other wireless means, when the ticket is pulled from the machine upon entry into the parking area.

0161Referring to <figref idref="f0002">Fig 1b</figref> again, the management systems 134 may be responsible for managing the overall lighting system in the environment 100 in co-ordination with various local management modules such as power management module 112, thermal management module 114, light management module 118, and some other types of modules.

0162In embodiments, the management systems 134 may include various sub-modules such as a demand response module 144, lighting management module 148, building management module 150, lighting prediction and management module 152, and measurement and verification module 170.

0163The demand response module 144 may manage the energy demand of the lighting systems 102 in the environment 100. In an embodiment, this module may also coordinate with the lighting management module 148 to manage the lighting systems 102. The demand response module 144 may utilize information from various sources to manage the energy demand of the lighting systems 102. The information may include power utility information, cost of energy, information on buying power on the hour, and some other types of information. The information may also include the rise in the cost of energy procured outside the building, amount of energy generation over a period (based on analysis of weather forecast by the lighting prediction and management module 152). In embodiments, the demand information may also be associated with billing information that may be generated via a metering unit for measuring the consumption of power. In effect, the demand response module 144 in co-ordination with various modules and sub-modules of the central control systems or management systems 134 may be managing the 'demand response' of the lighting systems 102 in the environment 100.

0164In an aspect of the invention, the demand response management of lighting involving intelligent management of the lighting beam angles produced by the lighting fixtures in a facility may be provided. In this aspect, control over individual light strips may be combined with the control network to provide the ability for "demand response" modulation of power consumption.

0165In an intelligent lighting system, the individual light strips may be turned 'ON' or 'OFF' or dimmed via a network interface. Further, a "Demand Response Front End" unit such as a demand response user interface 162 may be created that can accept demand response event information from the utility and translate it into commands for the lighting systems 102. In an embodiment, the above-created unit may be combined with a zone control system that can specify which zones are mission-critical (and not subject to being turned 'OFF' during an event) and/or which can be turned 'OFF' or dimmed. In an embodiment, the light strips may be dimmed (to minimum IES levels or even lower) for safety instead of completely turning them 'OFF'. In another embodiment, they may be regulated based on pre-determined parameters.

0166Another sub-module of the management systems 134 may be the lighting management module 148 that may be involved in the control and regulation of lights and lighting fixtures 102. The information generated by sensor 120 may be utilized and digested by this module to manage the lighting fixtures in the lighting systems 102. This module may be specifically involved in the operation of the lighting fixtures specifically LED based lighting fixtures 104.

0167Similarly, the other sub-module, building management module 150 may manage and control various aspects and information related to a building (that may be a part of the environment 100) or a facility.

0168Examples of the information related to the building or the facility may include check-in/check-out information, information regarding exit doors and emergency doors, information regarding various sections of the building including sections of specific concern (those housing sensitive material such as inflammable material), information regarding the parking, and other some other types of information.

0169In embodiments, the lighting management module 148 may automatically control and manage the lights using an intelligent system such as remote light monitoring system.

0170In an aspect of the present invention, the lighting management module 148 may also co-ordinate with other modules of the management systems 134. For example, the lighting management module 148 may co-ordinate with the building management module 150. The building management module 150 may direct information regarding check-in or checkout of a vehicle from the warehouse. The lighting management module 148 may in turn send a command to the local light control system in the path of the vehicle, thereby illuminating the area of path of exit or movement of the vehicle.

0171In another example, the building management module 150 may send information regarding emergency scenarios such as fire to the lighting management module 148. Consequently, the lighting management module 148 may give instructions to local management modules to shut-off power supplies to the lighting systems 102.

0172The lighting prediction and management module 152 may manage the lights in the environment 100 by analyzing the usage of lights in the past. Based on the analysis, the lighting prediction and management module 152 may predict the lighting requirements for the future and may create or manage the sudden changes in light and energy requirements more effectively.

0173In an aspect of the present invention, lighting prediction and management module 152 may utilize information on usage patterns to optimize many processes across many applications, including those to minimize energy consumption of a facility. This process is described below in detail.

0174The process may start with an intelligent lighting system 102a, which may include sensor 120 (of any type), some network for carrying sensor data, and a central computer to which the sensor data is logged. Examples of relevant sensor types may include occupancy, temperature, ambient light, and motion sensors.

0175By analyzing past patterns of sensor data, the control system or management systems 134 may make predictive decisions that may reduce overall energy consumption or optimize some process. For example, if the management systems 134 observed that a particular warehouse aisle is accessed very infrequently, the ambient lighting level of that aisle may be lowered in order to save costs.

0176This sensor data may be compiled for use by the above management systems 134 (in order to reduce costs or increase safety, as explained above) or exported for use by some other system (such as a warehouse inventory management system, parking garage management system, security system, or so on).

0177In an embodiment, forecasting (cyclical and seasonal) through lighting systems to determine better layouts for plant may also be provided by the lighting prediction and management module 152. For example, the management systems 134 may compile data with a purpose to rearrange and find optimal layouts for warehousing (such as layout for stacks and fixtures inside the facility).

0178In an aspect of the present invention, lighting systems 102 may be managed based on mutually agreed parameters between the operator and a third party. Consider a scenario wherein the management and operation rights of the lighting systems 102 are sold to a third party or an operator under a term or rule or price based contract/agreement. In such a case, the sensors associated with the lighting systems 102 may measure various factors such as maintenance levels, light levels, energy usage, and some other type of factors and variables. For example, the sensors may measure and store the amount of foot-candles available in a particular region, at may be a specific time and/or during a specific event.

0179The measurement and verification module 170 may log or store the above-described measurements by the sensors. In embodiments, these measurements may be verified against parameters laid down in the third party agreement or contract. An analysis between compliant versus contractual data may also be conducted.

0180In embodiments, various reports may be generated based on the above analysis. Further, reports may be generated in accordance with contract requirements and parameters.

0181In other embodiments, the above-generated reports may be sent to a third party for billing, certification, and some other types of verification purposes.

0182In an aspect of the present invention, the measurement and verification module 170 may perform billing verification for external energy sources. For example, the measurement and verification module 170 may track the cost of energy at a particular time of the day based on the demand information received from the UES 180 in the environment 100. The tracked information may be further compared with generated bills to ensure proper billing by the utility and external energy sources.

0183As described herein, a third-party may administer the lighting system. Management systems 134 may meter light delivered to environment 100, subsequently the customer may be billed according to the light delivered. For example, an administrator of lighting system may provide the lighting arrangement to an event management company for a couple of days. The arrangement may include illuminating a specified area for a fixed number of days. In this example, the event management company may be billed according to a mutually agreed contract, utilization of electricity, a fixed sum, and/or based on some other types of mutually accepted norms. In this example, the event management company may also be billed according to the total luminance delivered on a per unit basis. Various light management systems may monitor light levels in order to verify proper operation of lighting systems and facilitate billing procedures. For this purpose, luminaires may have embedded light sensor to measure total ft-cd delivered.

0184Further, the measurements may be logged in order to facilitate auditing and billing procedures.

0185In embodiments, camera-based systems (equipped with proper calibrations and filter) may be used to measure ft-cd over a broad area.

0186Various light management systems may also be programmed to generate utility grade auditable reports for billing and system verification.

0187In other embodiments, utility-grade M&amp;V may be integrated into fixture by providing black-box module support (e.g. gaming random generators). Light fixtures or associated control systems may measure the electricity they've consumed, and report it back to a utility for billing purposes. Utilities may use the measurement and report capacity of the light fixtures to do testing of the circuits and firmware running on an electric meter, as an inaccuracy, intentional or otherwise, may have direct revenue implications. Rather than trying to test the entire fixture to the nth degree, utility-grade metering may be provided by a measurement and verification module 170 that is independently tested and thus trusted by the utility.

0188In an embodiment, light sensors 120, separate from fixtures, may be live/active on network 142 and may be monitored by various light management systems. In addition, total delivered ft-cd may be estimated by luminaire or light management systems based on luminaire runtime combined with initial calibration and open-loop depreciation estimates.

0189Similar to sensors, camera-based systems (with proper calibration and filters) may also be used to measure ft-cd over a broad area (say a big parking lot.)

0190Luminaires may emit structured light (distinct signature) in order to distinguish luminaire-delivered light from ambient light. This may be useful for auditing or configuration purposes, where a distinction between grid power consumption and power from other sources may be required.

0191Likewise various measurements and data logs may be used to reconcile against utility kWh billing.

0192The management systems 134 may further include rules databases such as demand response rules database 154, third party rules database 158, internal administration rules database 160, and logging and reporting database 172.

0193In an embodiment, the light management systems such as module 148 may automatically manage reaction to utility demand response event in order to reduce system power consumption by turning off all or some luminaires in the system. In other embodiments, only a selected luminaires from specific zone(s) may be switched off; consequently reducing the brightness of the luminaires to a predefined level. For example, luminaires near the windows and daylight structures may be switched off during the day upon receiving signals from outdoor sensors to reduce the power consumption. Demand response management methods may apply to any of the lighting fixtures described herein as well as lighting fixtures not described herein.

0194In embodiments, the demand response rules database 154 may be a repository of a set of rules or logic that may help the management modules, specifically demand response module 144, to control and manage lighting systems based on the power demand information.

0195The administration of the lighting systems 102 in the environment 100 such as building management for the warehouse, manufacturing facility, or an inventory may enter into a term and price based (such as flat rate based) contract with the third party (as explained earlier). Various lighting inspirations in the environment 100 may prove to be a type of investment and may yield effective return on investment (ROI) over a period. Thus, such contractual arrangements may be managed and tracked based on certain rules or agreed parameters of contract. In this context, specific rules may be laid down for managing such arrangements. These rules may be embedded in a repository such as a dedicated database.

0196In another aspect of the present invention, light measured in foot-candles may be sold into a facility and management of the lighting systems in the facility within base criteria (e.g., measures the light to verify compliance with an agreement, allows to blend cost of installation over years of a performance agreement). Considering the capital cost of retrofit, LED lighting systems may be higher in the short term. Therefore, as a way of getting around this for capital-constrained customers, a new class of performance-based contract may be created that may revolve around foot-candle distribution.

0197The above concept may be explained with the help of a process that may begin by dividing a facility to be re-lit with intelligent LED based lighting fixtures 104 into zones defined by use of space (e.g., high stacks vs. loading) or other criteria. For each zone, an objective metric (such as foot-candle level) or set of metrics may be defined.

0198At a next step, existing facility performance vs. metrics may be measured prior to conducting retrofit approach. Similarly, the customer's existing energy bills to determine price-performance of existing lighting system may be evaluated. Further, a long-term performance-based lighting contract may be signed with the customer that specifies zones, metrics, and bounds on each metric. The intelligent lighting system may then be installed. Furthermore, performance of lighting system vs. metrics may be monitored via one or more of several mechanisms such as manual measurement at some schedule, automated measurement via individual sensors, automated measurement via networked sensors, and some other types of mechanisms.

0199Further, performance numbers for auditing purposes may be logged. In an embodiment, billing may be based on a flat fixed price. In another embodiment, billing may vary with performance vs. metrics (e.g., user can opt to turn lights 'OFF'). In another embodiment, real-time kW/hour pricing may be adopted. In other embodiments, utility demand response programs may be used for auditing purposes.

0200With respect to billing corresponding to the consumption rate, the light management unit or module 148 may receive billing information (kWh billing rate) directly from the utility (e.g. through IP connection) or from third party device Supervisory Control and Data Acquisition (SCADA) box. <figref idref="f0015">Fig. 14</figref> depicts one such configuration using SCADA software. In the environment 100, various utilities may be located such as security 1402, meter and expense 1404, lighting units 1408, parking 1410. Information from all these utilities may be accessed by an I/O interface 1418, that primarily include elements such as cameras 1412, sensors 120, meters 1414, and some other I/O elements. These are further associated with a controlling interface of controllers 1420 that may be composed of all control and management modules associated with the system. SCADA software interacts through a network with all these interfaces to generate various reports such as billing information. This billing information may be utilized to modify either automatically or manually (via an agreed upon deviation plan) the rules for managing the lighting systems.

0201Referring to <figref idref="f0002">Fig. 1b</figref>, the third party rules database 158 may be a repository of rules or logic that may help the management modules to control and manage the operations and rights related to the third party. In addition, the third party rules may be the rules that may lay out the acceptable way of managing the 'selling rights' and the 'third party rights.' The selling rights may be associated with the building management and the third party rights may be associated with the third party that may be entering into the contract. For example, the internal administrator may limit the third party rights to management of ambient lighting systems solely. The demand response module 144 may identify wastage of energy in the ambient lighting systems (cases where lights are not switched 'OFF' during the day, and so on). Based on this information, the internal administrator may temporarily switch over the control from third party to internal management modules and may levy a penalty on the third party. The rules for levying the penalty may be set forth in the contract.

0202Similar to the third party rules database 158, the internal administration rules database 160 may include rules and logic that may define activities performed by an internal administrator. For example, the internal administration rules database 160 may define rules for a manager of the warehouse to regulate the lighting systems 102 in a certain specified way.

0203In another scenario, there may be rules such that the internal administrator may also manage and oversee the operations of third parties. In an embodiment, the internal administration rules database 160 may define hierarchy for maintaining the lighting systems 102. In an aspect of the present invention, the internal administration rules database 160 may also define the rules for general management within the environment 100.

0204In an embodiment, the logging and reporting database 172 in association with the measurement and verification module 170 may log information obtained from the environment 100 and report the information when needed.

0205The environment 100 may also include the user interfaces 138 through which various users may interact with diverse elements of the environment 100. The users may include the internal administrator, third parties, and the like.

0206Referring to <figref idref="f0002">Fig. 1b</figref>, the user interfaces 138 may include demand response user interface 162, light as a resource interface 164, and internal administration user interface 168. The user interfaces 138 may be a Graphical User Interface (GUI), Web User Interface (WUI), Intelligent User Interface (IUI), Voice User Interface (VUI), Touch interface, and some other types of user interfaces. In embodiments, the various user interfaces 138 (demand response user interface 162, light as a resource interface 164, and internal administration user interface 168) may also interact with each other. In other embodiments, the user interfaces 138 may interact with the three rules databases. For example, consider a region wherein natural light may be available. This condition may be sensed by sensor 120 and may be transmitted to the management systems 134. Based on the impetus received from the management systems 134, the third parties may decide to either turn-off or fade away the lights (decrease the intensity of illumination of lights) for this region from the light as a resource interface 164.

0207The demand response user interface 162 may interact with the various management modules, specifically demand response module 144, for receiving and managing various demand response information in the environment 100.

0208In an aspect of the present invention, lighting control system with an electricity demand response interface may be provided. In electricity grids, demand response (DR) refers to mechanisms to manage the demand from customers in response to supply conditions. For example, electricity customers may be made to reduce their consumption at critical times or in response to market prices. Conventionally, hardware-based demand response systems are not tightly integrated with lighting control systems, adding installation complexity and cost.

0209In an aspect of the present invention, lighting management module 148 with the electricity demand response interface may be provided. In the electricity grids, demand response (DR) may refer to mechanisms for managing the demand from customers in response to supply conditions. For example, electricity customers may be asked to reduce their consumption at critical times or in response to market prices.

0210Similarly, the internal administration user interface 168 may be involved in the interaction of the internal administrator with various modules, sub-modules, and systems of the present invention. For example, the internal administrator may generate specific instructions using this interface for other users in the environment 100, related to emergency operations such as exit instructions in case of fire.

0211The present invention may disclose a lighting system designed for retrofit applications consisting of a central "master" lighting fixture, which may connect to high-voltage power (and control signals), and one or more "slave" lighting fixture, which may connect to a low-voltage power bus provided by the master lighting fixture.

0212In an aspect of the present invention, a novel retrofit lighting system for use in parking garages may be used. Conventionally the garages may be wired in a "single row" configuration, with a single row of junction boxes running down the middle of each driving aisle. The addition of any additional high-voltage wiring to the ceilings may pose a difficulty, because the wiring would have to be contained in protective conduit and the surfaces may be concrete. Therefore, the lighting system may consist of a master lighting fixture that may be mounted directly to the central junction box, and a pair of low-voltage slave lighting fixtures that may be connected to low-voltage power ports on the master lighting fixtures.

0213In an aspect of the present invention, an LED (e.g., highbay, parking garage, outdoor) based lighting fixture 104 such as a high intensity discharge lamps with integral emergency lighting function may be provided. The high-intensity discharge lamps that may be used for the above applications may take a longer time to reach full intensity upon application of power. Therefore, a separate set of fixtures may be installed in order to provide light after a power failure.

0214The present invention describes an LED based lighting system 102a that may provide "emergency" lighting. In an embodiment, the fixture may be an integrated energy storage device that can supply power for some period.

0215In another embodiment, the fixture may have a modular energy storage device that can supply power for some period.

0216In another embodiment, the fixture may have external supplementary power connection that can supply power for some period.

0217In other embodiment, the fixture may be designed such that the power source in the above embodiments supplies power to only a part of the LED array.

0218In another embodiment, the fixture may include some mechanism for reporting power failure back to a central control point.

0219In an aspect of the present invention, an LED based lighting fixture 104 with integrated RFID reader may be provided.

0220Conventionally, installation of RFID systems in industrial environments is costly due to the expense of wiring and supplying power. Integrating the RFID reader into the fixture may reduce the cost and complexity of such installations.

0221The present invention describes an LED based lighting system 102a that may be integrated with a RFID reader module and a data network to transfer RFID data to a central processing point such as management systems 134. The RFID reader may draw power from the fixture and further may use the system's data network for communication.

0222In an aspect of the present invention, lighting systems 102 with integrated electricity time-shift may be provided.

0223Conventionally, utilities are known to move towards variable pricing models, where electricity rates vary in a continuous or discrete manner over time. Integrating an energy storage device into the lighting systems 102 (at the system or fixture level) may create a way to take advantage of these rate fluctuations by altering the consumption profile of the lighting systems 102.

0224Similar to the billing rates, information regarding electricity rates variation may be shared across the network 142. This information may be further utilized by the management system 134 to store energy in power storage means (e.g. energy storage facility 184) when power is less expensive, and subsequently utilize the stored energy to power luminaires and light modules when needed, thereby leveling off grid consumption.

0225It is known that lighting systems consume electricity at the exact moment they utilize it. Therefore, an energy storage facility 184 (such as a battery) may be added to the lighting system (as explained in reference with <figref idref="f0001">Fig. 1a</figref>). Consequently, electricity may be consumed from the grid at times of lower rates, stored for later, and then consumed according to the normal schedule.

0226In an aspect of the present invention, lighting system with integrated payment gateway may be provided. In an embodiment, EZpass-like reader may be integrated into intelligent lighting system to provide a payment gateway.

0227This may be used in applications such as electric car charging. EZpass-like reader may be integrated into the lighting fixtures to handle payments associated with charging of electric cars in parking garage or parking lot facilities. Further, this may be used in parking space payment applications as well.

0228In an aspect of the present invention, lighting systems 102 with integrated camera for facility security systems may be provided. Many commercial and industrial facilities currently install security camera systems to allow for monitoring of facility.

0229In an embodiment, the camera may be integrated directly into the fixture. Alternately, camera may be integrated into the fixture via modular power and data connection. Thereby, the camera video may be transmitted to the central location using the fixture's integrated network.

0230In another aspect of the present invention, ruggedized or explosion-proof LED based lighting fixture 104 with integrated sensing and network may be provided. Certain types of industrial facilities such as laboratories, pharmaceutical labs, food processing, gas stations, and some other types of laboratories may also require the use of "explosion-proof" fixtures.

0231In an embodiment, an explosion-proof LED fixture may be combined with a sensor 120 or a sensor module designed to detect dangerous conditions. A network module such as network 142 may communicate the presence of these conditions to other equipments such as process control equipments, blast doors, fire suppression systems, and some other types of equipment.

0232The above-disclosed embodiments may also be disclosed to include functionalities such as thermal management designs, power management designs, LED control techniques, system coordination and control techniques, explosion proof fixtures, leak detection, selective UV lighting, retrofit brackets, power and data wires/cords, and some other type of functionalities.

0233Various embodiments of the present invention may be applicable to a variety of environments and applications such as warehouse, manufacturing facility, parking garage, parking lot, street lighting, highway, smallstreet, prison, indoor pools, gymnasium, dormitory/high density housing, stadium/arena, task lighting, clean rooms with UV, retail, bridge, tunnel, and some other types of environments and applications.

0234The manufacturing facility may further include steps for sensing hazardous conditions and connecting to real-time monitoring systems for controlling ventilation, blast doors, etc. Also, it may include steps for warehouse temperature sensing for pharmaceuticals/food applications in combination with steps for logging into fixture and some auditing system.

0235Referring to <figref idref="f0003">Fig. 2</figref>, the present invention may provide methods and systems for managing artificial lighting in the environment 100. <figref idref="f0003">Fig.2</figref> illustrates lighting systems 102a and 102b. In an embodiment, the lighting systems 102 may be an LED based lighting system. It may be noted that the invention may also be realized with plurality of other lighting systems such as 102c, 102d, and so on. The lighting systems 102 may also include a plurality of light strips 210 that may be producing different beam angles 130. Also, the area of illumination as a result of the various beam angles 130 may be in part overlapping.

0236These lighting systems 102a and 102b may be associated with each other in a network. Further, they may also be controlled by a data network 142. In an embodiment, a set of lighting parameters 202 may be stored in a database. These lighting parameters may be a result of the mutual agreement between an operator 204 and a third party manager 208.

0237In the environment 100, measurements may be conducted to assess the conditions and various aspects of lighting. For example, the sensors 120 may determine a fall in the voltage levels and intensity of the lighting fixtures and may transfer this information to the management systems 134. The lighting management module 148 may utilize these measurement values to generate a command to increase the voltage supply being delivered to the lighting systems 102 and subsequently regulate the artificial lighting.

0238In other embodiments, the management systems 134 modules such as measurement and verification module 170 may compare these measurement values received from the sensors 120, with at least one of the stored lighting parameters. Based on the comparison the management systems 134 may make an adjustment to at least one of the lighting systems 120. For example, based on the comparison between the value of beam angle received from the sensors 120 and the beam angle value stored, the measurement and verification module 170 may adjust the beam angle 130 produced by the lighting system 102a.

0239There may be various interfaces through which the operator and the third party manager may interact. <figref idref="f0003">Fig.2</figref> illustrates a third party manager user interface or light as a resource user interface 164 and an operator user interface or the internal administrator user interface 168, previously depicted in <figref idref="f0002">Fig. 1b</figref>.

0240The third party manager user interface 164 may be adapted to provide the third party manager 208 with tools for performing various functions. These tools may be operational commands, switches, sub-interfaces, and some other types of tools. For example, the interface 164 may be equipped with tools for adjusting at least one of the lighting systems 102, changing and/or adding and/or removing at least one of the lighting parameters 202 from the plurality of stored parameters.

0241In embodiments, third party tools and devices may control and manage various systems inside the environment 100. These third party devices may be for various systems such as building automation systems (conventionally provided by Honeywell, Johnson controls, etc.), lighting control systems (similar to those of Lutron, LightCorp, etc.), industrial control systems, security systems, process control systems, inventory control systems, warehouse management systems, and some other systems.

0242The third party manager 208 may also utilize the third party manager user interface 164 for manually overriding automated decisions made by the management systems 134. For example, consider a scenario wherein during a day-time, based on set forth rules, the management system 134 increased the intensity of the lights operational near the entry of a parking lot. The third party manager 208 on identifying that the natural and ambient light may be used instead of the lighting systems, may override the above automated decision and switch off the operational lights by sending an appropriate command from the user interface 164. In another embodiment, the tools may also be used for determining which of the stored lighting parameters 202 may be modified by the operator 204 of the environment 100.

0243Similar to the third party manager user interface 164, the operator user interface 168 may be adapted to provide the operator 204 with tools for adjusting and/or changing at least one of the lighting parameters 202 from the plurality of the stored parameters. For example, the operator 204 may decide to change the values related to maximum lumen output. He may do so by changing the predetermined values stored in the database. In another example, the operator user interface 168 may also be adapted to provide the operator 204 with tools for visualization of the energy consumed by one or more lighting systems 102. Examples of visualization tools may include charts, 3D graphics, CAD, MATLAB, MS Excel, and some other types of visualization tools known in the art.

0244In addition to lighting parameters 202, a plurality of energy demand parameters 212 may also be stored in the database in the management systems 134. Each of these energy demand parameters 212 may be associated with a lighting parameter 202 such that whenever the management systems 134 may receive information regarding the energy demand of the lighting systems 102 in the environment 100, then this information may be subsequently utilized for controlling the lighting systems 102. In embodiments, the energy demand parameters may be associated with the utility and/or alternate energy demand of the lighting systems 102.

0245<figref idref="f0004">Fig. 3</figref> illustrates management of the artificial lighting in the environment 100 upon receiving the demand response, in accordance with an embodiment of the present invention. Energy demand information received by the management systems 134 may be compared with the stored energy demand parameters (<figref idref="f0003">Fig. 2</figref>); this comparison may be evaluated based on a rule stored in the database. Based on the above evaluation, control information from the management systems 134 may be communicated to the lighting systems 102 via the network 142.

0246For example, the lighting systems may communicate the demand and/or cost in energy during the peak load hours to the management systems 134. Energy parameters related to alternate energy usage and utility energy usage may be compared to this demand information. The compared values may then be evaluated based on a rule, such that if the values have a difference more than a predetermined value, the demand response module 154 may command the utilization of alternate energy in order to meet the peak demand.

0247Similarly, based on the evaluation the beam angle and the intensity of light associated with it may also be regulated for the lighting systems 102. Consider a scenario wherein the sensors 120 communicate the fall in the beam angles 130 for the lighting systems 102b at the entry of the warehouse. This information received from the sensors 120 may be evaluated based on the lighting rules set in the database such as third party rules database 158. The rule may be set forth such that the desired beam angle may be of 30 degrees for the lighting systems 102. The third party may initiate a command from the interface 164 to increase the beam angles 130 for the lighting systems 102b.

0248The rules set forth in the management systems 134 may also be modified, in accordance with an embodiment of the present invention. In another example, the lighting systems may be regulated by modifying the amount of time the lighting systems 102 may be turned-on in response to the sensor inputs.

0249Another example of regulating the lights may be modification in the brightness of some sub-set of the lights from the complete set of lighting system 102a.

0250Referring to <figref idref="f0004">Fig. 3</figref> again, an energy provider user interface 304 may be provided that may be adapted to provide an energy provider 302 with tools for adjusting, changing, removing and/or adding lighting parameters 202. These tools may also be adapted to override manually, the automated decisions made according to the stored lighting parameters 202. Further, tools may also determine which of the stored lighting parameters 202 may be modified by the operator 204.

0251In an embodiment, the energy provider 302 may also be the third party manager 208.

0252<figref idref="f0005">Fig. 4</figref> depicts the management of the lighting systems 102 in the environment 100 based on the assessment regarding the utility energy and stored alternative energy. As described earlier in <figref idref="f0001">Fig. 1a</figref>, the energy produced by the alternative energy source 128 may be stored in an energy storage facility 184 so that this energy may be utilized at some other different time. For example, energy produced by the solar energy and wind energy may be stored in batteries, flywheels and some other types of storage facilities. Upon receiving information regarding the rise in the cost and consumption of conventional energy from the lighting systems 102, the demand response module 144 may automatically switch over completely and/or partially the power supply from the conventional sources to the stored alternate energy sources and may sustain this till it receives another information from the lighting systems or command from the user interfaces.

0253The demand response module 144 may also receive utility demand information from the lighting systems 102 and may compare this information with utility energy demand parameters 302. Further, the demand response module 144 may make an assessment regarding both utility energy and alternative energy options. This assessment may be regarding various distinct features and options available from both the sources. Based on the assessment, the management systems 134 may subsequently select one of the above assessed options and may generate an appropriate command for the regulation of the lighting systems 102. For example, at any instant it may be assessed that the overall cost and advantages (such as installation) obtained from the utility energy sources 180 outweighs the alternate energy sources 128 (considering the operational costs as well), the management systems 134 may decide to automatically switch over to the former energy source.

0254Referring to <figref idref="f0006">Fig. 5</figref>, the figure illustrates the management of lighting systems 102 in the environment 100 based on lighting measurements being made. As shown in the figure, the lighting systems 102, such as LED based lighting systems 104 may be present in the environment. The interaction and association among the lighting systems 102 may take place via a wired and/or wireless network 142. As previously described in conjunction with <figref idref="f0003 f0004 f0005">Figs. 2-4</figref>, the mutually agreed upon stored lighting parameters may be utilized to assert compliance of the measured lighting conditions in the environment 100. The lighting conditions may be automatically measured by sensors 120 that may be installed in the lighting systems 102 or within the environment 100. The above measurements may be regarding the levels of brightness, operating status, power consumption, operational time (run hours), tampering or damage to the lighting systems 102.

0255In another embodiment, the automatic measurements may also be made regarding the third party systems that may be responsible for assessing and monitoring the lighting systems and their associated interconnections. For example, third party systems such as lights in the third party area, user interfaces, visualization tools and their energy consumption may be measured to assess the conditions of lights and power in the environment 100.

0256Automatic measurements made by the sensors 120 or some measurement units may be communicated to the management systems 134, third party and operator terminals over the network 142. The measurement may be made either periodically or upon occurrence of an event. For example, sensors 120 may measure the lighting conditions based on a rule, such as a specific time of the day (during lunch time or closing hours). In other example, measuring units may automatically measure the lighting conditions when some other sensor associated with the system is triggered (measurement of the switches in power 'ON' mode, upon sensing an emergency). In yet other example, measurements may be made based on an energy demand parameter. Still in some other cases, measurements may be conducted only when the sensors 120 receive a manual request from one of the user interfaces.

0257In accordance with an embodiment, the above described compliance checks may also be reported in the form of generated reports 502. The reports may include tabular data, instructions, recommendations, measurement data, compliance status, reporting parties. The reports may also include information such as percentage time in and/or out of compliance, cost of energy used to maintain compliance, amount and/or cost associated with the usage of alternative energy, efficiencies and maintenance cost of the lighting systems 102, and some other types of information. The reports may be hard-cover or soft copies. Additionally, these reports may also include information regarding the various modules, units, and systems of the lighting systems 102, such as a luminaire system.

0258<figref idref="f0007">Fig. 6</figref> illustrates an exemplary modular luminaire system 602, in accordance with an embodiment of the present invention. The luminaire system 602 may be constructed by assembling various components and may consist of a series of light modules 604 and one or more power management modules or modules 112.

0259Each of the light modules 604 may be characterized by varying lumen output and beam angles 130. The lumen output and beam angles 130 for the light modules 604 may be predetermined. However, it may be appreciated, that the light modules 604 may be controlled and guided accordingly to generate a desired intensity of light, lumen output, and/or beam area coverage.

0260Each of the power management modules (modules) 112 may be associated with one or more light modules 604. The luminaire system 602 may also include a fixture frame 608 to provide a mechanical support to the light modules 604 and the power management modules (modules) 112.

0261In certain cases light modules 604 may be in the form of light bars or light rods. These light bars may incorporate both thermal and optical systems (e.g. thermal management module 114 and light management module 118) to constitute a modular LED assembly. These light modules 604 (light bars), power management module 112, and a mechanical structure similar to fixture frame 608 may together represent a modular LED luminaire.

0262In embodiments, the fixture frame 608 may provide a mechanism to rotate the light modules 604 around one or more axes. For example, as shown in the figure, the fixture frame 608 may be rotated around axes AA' and BB' to render a flexible and modular feel to the luminaire system 602. Similarly, each of the light modules may be rotated around axes CC' to modify the orientation and the beam area distribution for the luminaire. In other words, each of the light bars may be rotated along at least one rotational axis independent of the orientation of the fixture frame 608.

0263In embodiments, rotation of the beam angles associated with these light bars may vary intensity of light at different orientations. This may particularly be useful in areas where the requirement of light in various corners or sections of the area may vary. For example, in a scenario where the light bars are automatically rotatable based on the sensory movement of the object near them, the beam angle of the light bar may be different in the position when the object is directly below than to the beam angle when the object is at a distance from the light bar.

0264In an embodiment, the light bars and the power management module 112 may be designed for easy and quick replacement. For example, conventional lighting systems may require a prior knowledge and expertise for replacing them. In some cases, apprehensions and fear related to safety may also be associated. However, the above light bars and power management modules 112 may be electrically and mechanically designed so as to facilitate easy replacement by a person who may or may not be a licensed electrical contractor.

0265In other embodiments, a user-replaceable optical assembly 610 may be used to modify the beam distribution of the individual light modules 604 and overall aggregate beam angle produced by the luminaire system 602. The optical assembly 610 may be user-replaceable such that any user may be able to replace the optic in a tool-less manner. Referring also to <figref idref="f0021">Figs. 20A and B</figref>, an example of a fixture with reconfigurable beam pattern is depicted. Using the same power management module and fixture frame, LED light bars that emit different beam patterns to get a different compound beam angle may be swapped in. The beam pattern of each individual light bar can be changed in order to change the fixture's beam pattern. Alternatively, the individual light bar beam pattern may be changed by swapping in a bar with a different optical profile, such as by swapping whole bar or swapping out optics on individual bars. In <figref idref="f0021">Fig. 20A</figref>, a fixture is shown where the LED light bars are emitting directional light distribution, which may be best for lighting tall aisles. One LED light bar 2004 is emitting a 10 degree beam angle while the other two light bars 2002 are emitting 60 degree beam angles, generating an aggregate beam pattern 2010. In <figref idref="f0021">Fig. 20B</figref>, the fixture is emitting uniform light distribution, which may be best for lighting open spaces. All three LED light bars 2008 are emitting the same 30 degree beam angle, generating an aggregate beam pattern 2012.

0266In an embodiment, there may be provided some means for re-establishing the environmental seal around the assembly. Also, the optical assembly 610 may be either secondary or tertiary optic assembly.

0267In another embodiment, the light modules 604 or light bars may be connected to the fixture frame 608 by means of various mechanisms such as a quick release mechanism. This mechanism may provide a combination of free-rotation and a tool-less easy replacement of the luminaires. <figref idref="f0009">Fig. 8</figref> depicts an exemplary quick release mechanism 800 for light fixtures. An LED luminaire 802 includes fixture frame 608, various management modules (power 112, thermal 114, light 118, electrical 174, and mechanical 178), and sensors 120. Mechanical quick releasing fasteners 804 attach the fixture frame 608 to a mount or wall 808.

0268In accordance with an embodiment, the quick-release mechanism may be a mechanical mechanism. For example, skewers, latches, and hooks may be used to provide quick-release attribute to the luminaires.

0269The quick release mechanism may also include magnetic connections or magnetic methods used for easy replaceability of the light modules 604. In other cases, a combination of magnetic means and mechanical means may be used in the luminaires.

0270In accordance with another embodiment of the present invention, the quick-release mechanism may serve as both a mechanical interface and a conduit for electrical power (e.g. electrical connections or wires 810) to the light bar.

0271In yet other embodiment, the quick-release mechanism may serve as a data conduit for communicating with intelligent circuitry onboard the light bar. For example, the mechanical structure (e.g. hook for quick release) may include sensors 120 capable of transmitting detected changes in the luminaire to a master control.

0272In an aspect of the invention, the power management module 112 may be integrated into the light bar or light module 604 (for example, as a compact module.) Therefore, in systems consisting of multiple light bars or modules 604 (<figref idref="f0007">Fig. 6</figref>), each bar may be associated with a specific power management module 112. In such a scenario, a master control module such as management systems 134 may distribute power and control signals to the power management modules 112 and subsequently to the light bars or modules 604 in the lighting system.

0273In an embodiment, the power management module 112 may be mounted coaxially at the end of the light bar. It may be noted that various other configurations may be practiced for arranging power management modules in the light bar as evident and obvious to a person skilled in the art.

0274In other embodiments, the mechanical structure i.e., the fixture frame 608 may be designed to include different number of light bars or modules 604 to the frame. The number and configuration of the light bars may be dependent on several factors. For example, for a given length of an extruded sub-frame, several light bars of round configurations may be arranged as shown in <figref idref="f0007">Fig. 6</figref>.

0275As per specific installation requirements, various types of fixture frames may be designed and used in the luminaires. Similarly, different types of power management modules 112 (depending on a specific set of electrical characteristics) and various types of light bars or modules 604 (depending on photometric/optical characteristics) may be used. These different types of fixture frames 608, power management modules 112, and light bars or modules 604 may be used to construct custom luminaires 802 for the consumers. For example, a luminaire with an adjustable fixture composed of fabricated steel and numerous holes may be provided with LED glow rectangular lights with varying beam angles and a luminous flux of 680 lumens (lm).

0276Similarly, for constructing the above types of custom luminaires 802, the luminaire assembly (or system) may be accompanied by a software configuration tool that may help the users to specify the combination of fixture frames, power management modules, and light bars for specific applications. Referring to <figref idref="f0023">Fig. 22</figref>, a flow diagram of a configuration tool for a modular lighting system is depicted. The configuration tool may be a software tool that lets a user input information about the space they are trying to light, and outputs the best fixture configuration to meet their needs. The tool may tell a user how to configure the fixture via light bar count, choice of optics, angular settings, and the like. Some input variables may be mounting height, aisle width, fixture spacing, surface reflectivities , desired ft-cd level, and ambient temperature. Some outputs may be number of light bars, a selection of optics for each light bar, and angular settings. The configuration tool may employ a logical process including the steps of: receiving input on at least one parameter associated with a lighting area 2202, receiving input on at least one desired lighting characteristic for the lighting area 2204, and selecting at least one of a number of led light bars, an optical profile for the led light bars, an led light bar fixture frame and an angular setting for the led light bars based on the input 2208.

0277Alternately, the steps for assembling the various components of the luminaire system 602 or LED luminaire 802 may be embodied in the software application so that it may act as a guidance or instruction manual for a purchaser of the luminaire system or assembly.

0278Conventionally, there are software systems that also allow manufacturers to create product prototypes to validate design and engineering data, and ensure satisfactory fit and function for custom products. However, in accordance with the embodiments of the present invention, the use of the software configuration tool will take this approach to another height where an increased customer satisfaction may be reported due to the active involvement of the consumer in designing a modular and customized lighting system.

0279In embodiments, the above described modular luminaire system 602 or LED luminaire 802 may also be driven by an efficient power management system to generate a lighting system that may be modular in design, cost-effective, environmentally adaptable, equipped to include variability in pricing models, and intelligently controlled. These features and some others will be described later in conjunction with appropriate examples and accompanying figures.

0280<figref idref="f0008">Fig. 7</figref> depicts a smart power management module 700, in accordance with an embodiment of the present invention. The figure illustrates an LED driver module 702 that may be connected to a power supply (power input).

0281As illustrated in the figure, the LED driver module 702 may provide power output to LED strings 704. These LED strings may be a part of the lighting systems 102. In addition, the LED driver module 702 may provide low voltage power output to the accessories associated with the lighting systems 102. The accessories may include sensors, network modules, management modules, user interfaces, and some other types of accessories.

0282Additionally, the power management module 700 may be provided with a network data input via network 142, to control the power provided to the LED strings 704. In embodiments, a data input for the receipt of analogue and/or digital data may also be provided.

0283'Easily replaceable' by the users may be a significant feature of the modular LED lighting systems. In light of this, a modular LED luminaire 802 consisting of different types of luminaires based on functionality may be used to replace existing lighting fixtures. The different luminaires may be a 'master' luminaire and a 'slave' luminaire. The master luminaire may connect directly to an existing AC drop by mechanical or electrical means and in turn may provide an auxiliary low voltage power output to the lighting system. Subsequently, one or more 'slave' luminaires may connect to the auxiliary low voltage power output, thereby, facilitating installation of luminaires without the expense of running additional electrical conduit.

0284In another embodiment, the modular LED luminaire 802 may include a 'master' power management module 112 and one or more 'slave' luminaires. Similar to the 'master' luminaires, the 'master' power management module 112 may be connected (mechanically or electrically) to an existing AC drop and may provide a low voltage power output. The 'slave' luminaires may connect to the low voltage power output and may be installed without the expense of running additional electrical conduit. As a result of this configuration, a reduction in wastage of power may be achieved.

0285Referring to <figref idref="f0022">Figs. 21A and B</figref>, a fixture with intelligent light modules is depicted in a schematic (A) and in profile (B). The lighting fixture includes a plurality of LED light bars (light modules 2102) mounted within a housing and a power management module (PMM) 112, wherein the intelligence and power conversion lives in both the PMM 112 (master control) and onboard the light bars. The LED light bar's driver 2104 and control electronics 2108 may be disposed within an enclosure mounted inline with the axis of rotation of the bar, to preserve airflow to a heatsink of the fixture. The PMM 112 may be arranged to receive local sensor input and to adjust an intensity of light emitted from the plurality of LED light bars in response to the received local sensor input.

0286Similarly, another intelligent design may include an integrated sensor enclosure such as a small bay that may be associated with the power management module 112. This bay or enclosure may protect the various sensors associated with the power management module 112 from any type of mechanical or other impact. For example, a fabricated bay may protect the temperature sensor 120 in the power management module 112 from forklift. In addition, this mechanism may keep the surface of the lens inside the assembly close to the bottom plane of the fixture thus allowing maximum angle or coverage and minimum obstruction for sensors. The sensors may be both field-installable and field-swappable. The optical element for each sensor module may be field-swappable based on usage. The usage may be end of aisle vs. center vs. general wide field-of-view. Examples of the various sensors that may be provided inside the integrated sensor enclosure may include Passive Infra Red (PIR) occupancy sensor, ambient light sensor, radiation sensor, particulate sensors, and some other types of sensors. Referring to <figref idref="f0024">Fig. 23</figref>, a fixture with integral sensor bay is depicted. In <figref idref="f0024">Fig. 23</figref>, a recessed or ceiling style occupancy sensor 2304 is integral with the fixture 2302. The sensor 2304 may be embedded inside a protected area of the fixture 2302, such as within a cavity designed to provide mechanical and electrical connectivity for a standard sensor module 2304 with features designed to protect it from damage before, during or after installation. The sensor module 2304 may have swappable lenses, where a variety of lenses may be carried on a "lens wheel" and easily rotated into place by a user, such as an installer. The surface of the sensor module lens may be arranged to be close to a bottom plane of the fixture 2302 to achieve a maximum of sensor input angles. In some embodiments, at least one of the plurality of LED light bars mounted in the fixture 2302 is modified by an optical assembly to emit a different beam pattern.

0287Likewise, the optical elements for each sensor may also be field-installable and field-swappable. For example, depending on the usage, the optical elements of the sensors 120 may be replaced (for use in the end of aisle, at the center, and/or a general wide field of view.) The various optical elements may be selected via a selecting mechanism such as a lens-wheel, thereby rotating different optics in front of the sensor. This selection and rotation procedure for sensor optical elements may allow an installer to select the proper optical configuration at time of installation. There may be various other selecting mechanisms such as on-off switches, variable control devices (sliders, knobs, wheels etc.), buttons, touch interfaces, keypads, momentary switches, voice-recognition systems, and some other types of selecting mechanisms.

0288In an aspect of the present invention, practices for smart power management may be applied. In accordance with an embodiment a power management module such as a power management module 112 may include an input power source, a controllable power output, and a microcontroller. The power output may be used for connecting the light bar and the microcontroller may modulate power delivered to each of the power outputs.

0289In an embodiment, the power management module 112 may provide a low voltage output for powering add-on sub-modules such as sensors 120, network interfaces, and some other types of sub-modules. Similarly, power management module 112 may provide a data input for these sub-modules so that control signals may be transmitted from sub-modules to the module 112. Referring also to <figref idref="f0025">Fig. 24</figref>, a power management module with modular sensor bus is depicted. Fixtures may have more than one sensor connected to them, with all of the sensors simultaneously observing some characteristic of the environment and passing that information back to the fixture. One way to facilitate this would be to have multiple distinct sensor inputs on the PMM, but an alternative way is a digital bus which can carry multiple sensors. The PMM 2402 may output DC power 2404 to supply multiple sensors, such as occupancy sensors 2408, ambient light sensors 2410, and RFID sensors 2412 and may provide a bi-directional data bus 2414 to gather information from the multiple sensors, where the sensors place data on the bus which may be formatted according to a standard protocol. In some embodiments, the sensors may be able to identify themselves (and their "type") to the PMM. The PMM may respond differently to different sensor types as so identified.

0290Referring to <figref idref="f0026">Fig. 25</figref>, a power management module with multi-input arbitration is depicted. The lighting fixtures may receive command inputs from multiple sources, such as a centralized control system 2504, a utility 2508, an occupancy sensor 2510, an ambient light sensor 2512, and an RFID sensor 2514, sensors connected to the fixture, sensor data conveyed from a remote sensor via a network, centralized commands, utility inputs, and the like. The PMM may process all of these inputs, then set the fixture's light level or each individual LED light bar's 2518 light level and power consumption based on a set of rules stored in the PMM's memory. The rule may determine a weight to apply to each of the input signals, combines those weighted signals via an arbitration algorithm, and determines the adjustment to the LED lighting system parameter according to the output of the algorithm. In an example, the fixture may have four inputs, an occupancy sensor onboard the fixture which relays binary input (occupied / not occupied), an ambient light sensor onboard the fixture which relays digital input on the amount of light sensed, an operating mode input relayed from a central controller via network that provides tri-state input (ACTIVE, INACTIVE, OFF) based on a parameter, such as time-of-day, and a demand response state (DR) input which may be relayed from a central controller via network and which may originate with a utility that provides binary input (event/ no event). The PMM may listen to all input sources, and decide what power level should be delivered to each of the associated light bars or lighting fixtures.

0291In environment 100, one or more input signals for controlling the functioning of the lighting systems may be provided from any of a variety of sources. For example, control signals may be transmitted by sensors 120 (for occupancy, ambient light, temperature, and some other factors), or by wired/wireless network 142. These input signals may be in turn received by the microcontroller which may associate a "weight factor" or "relevance weight" to the signals. The weighted signals may be further combined using an appropriate algorithm such as an arbitration algorithm. As a next step, the output of the arbitration algorithm may be used to set the controllable power outputs.

0292Referring to <figref idref="f0027">Fig. 26</figref>, a power management module 2602 with power source arbitration is depicted. The PMM 2602 may modulate power drawn from multiple power inputs based on real-time or static information about the impact of each input, whether that impact is economic ($), environmental (renewable vs. not), or practical (amount of power available or remaining in source). A fixture 2612 may include a PMM and multiple power input sources 2604, 2608, 2610, where the PMM 2602 receives information about the power sources such as price per kWh, amount of kWh remaining in a storage device, or instantaneous power available from a renewable energy source and may set the intensity, and thus power consumption, of the fixture 2612 based on this information and rules stored in the PMM 2602. The PMM may combine the impact information via an arbitration algorithm, and select which power input to utilize based on the output of the algorithm in accordance with at least one rule stored in a memory of the processor. For example, a fixture may consume 100W maximum at full intensity. The fixture may have three potential power sources: solar 2604, utility grid connections 2608, and a battery 2610. The solar input may be capable of providing 50W maximum (Available power = S; Power used by fixture = Ps), the utility grid connection may be capable of providing as much power as needed (Power used by fixture = Pu), and a high-capacity battery may be capable of storing up to 500W-hr and may consumer power in charging (Available capacity = B; Charging power supplied to battery = Cb; Power used from battery = Pb). The PMM 2602 may have a target power output (T) based on sensor input, manual input, or command input from a centralized controller.

0293The microcontroller may understand the relationship between the power delivered to each light bar and the luminous efficacy (the indication of how well the light source provides visible light from a given amount of power/electricity) of each light bar. This information may be used by the microcontroller to maximize fixture efficacy over a period. The efficacy of an LED fixture (how much light is produced per unit power input) is not constant over the fixture's power range. When the fixture is driven at high power levels, the thermal stress on the LEDs makes the efficacy fall off, and at low power levels, the fixture may not be able to deliver sufficient illumination to the environment. If the fixture has a microcontroller onboard which internally stores an accurate model of the fixture's efficacy (say, as a function of one or more variables such as ambient temperature), the fixture may be operated at a power level that maximizes efficacy while still providing a sufficient amount of light given the current values of the relevant variables.

0294In another embodiment, information about relative price of power (pricing signals) consumed by each of the input power sources may be received by the microcontroller. These pricing signals may be combined using an arbitration algorithm. Further, based on the output of the algorithm, the microcontroller may select which input power source to utilize further and which input power source may be halted.

0295In an embodiment, the source of the input power may be an energy storage device such as battery, ultra-capacitor, and some other device or energy obtained through energy storage facility 184. The storage device may be connected directly to the luminaire or group of luminaires. As shown in <figref idref="f0001">Fig. 1a</figref>, the energy storage facility 184, AES 128, and UES 180 are all associated with the lighting systems 102 in the environment 100.

0296In certain cases, the smart power management module or module 112 may also provide indications regarding status (e.g. need for replacement) of the light bars or light modules 604 to the users and/or operators.

0297For example, as shown in <figref idref="f0010">Fig. 9a</figref>, a RGB - tricolor LED on a light bar and/or power management module 112 may indicate that the light bar has a tungsten filament (indicated by red (R) color 902), variable beam angle (indicated by green (G) color 904), and luminous flux of 600 lumens (indicated by blue (B) color 908). Similarly, different color codes may be used to indicate various other features of the light bar.

0298In another embodiment, the colored LEDs on the light bar may blink according to a code to indicate the type of light bar to be replaced. <figref idref="f0010">Fig. 9b</figref> depicts another light bar in which red LED 910 blinks in case of emergency, and a blue LED 912 blinks in the case when the sensors 120 detect the presence of an object 914 in the vicinity.

0299In yet other embodiments, a handheld scanner may be used for reading encoded Infra Red (IR) or visible light from the luminaire to determine its type. The scanner may be activated with laser detector or IR hand-shake.

0300Alternately, the light bar information may be transmitted to a remote diagnostic equipment or a repository such as a database including information regarding make and specifications of each type of light bar via wireless means (e.g. radio frequency waves.)

0301The power may be modulated in the power management module 112 by connecting light bars in various configurations. For example, the light bars may be connected in series and shunted across a specific/individual light bar to throttle its brightness.

0302The power management module 112 may also intelligently detect the presence of a dead or non-working light bar by sequencing through output channels and detecting power consumption at each step.

0303In an embodiment, the power management module's power output may be combined with a TVS shunt located on the light bar. For example, consider a series of LED bulbs and a shunt in a lighting circuit. In case a light bulb is damaged from the series, the power management module 112 will receive this information and immediately redirect or rebalance the voltage load on the remaining light bulbs. It may happen that the remaining light bulbs will stop working, but this will thwart any damage such as fuse of the entire series of light bulbs.

0304In addition to various control functions, the power management module 112 may also be associated with measurement and verification functions. This may be similar to the measurement and verification module 170 of the 'master' or central management systems 134, as explained in <figref idref="f0002">Fig. 1b</figref>.

0305The measurement and verification functions may also be performed by sensors such as a power sensor that may be located on the AC input. Alternately, the measurement and verification may be performed by a light sensor positioned to sample reflected light from the fixture's beam.

0306All the above power managements may be logged for auditing purposes. This information may be further utilized for cross-checking the total generation and consumption of power within the environment 100.

0307In an aspect of the present invention, the power management module 112 may estimate the extent of visibility of optical elements (lenses, mirrors, and elements in the reflector system) associated with the luminaire. The estimation may be conducted by sensing and measuring light both inside and outside the luminaire, and comparing the two measurements. For example, if the power management module finds more than five percent change in the two measurements, it may be deduced that the lens was dirty. This type of 'dirtiness' measurement may be extended to other optical elements as well.

0308Upon receiving a 'dirtiness' measurement, the power management module 112 may notify the user or operator to clean the optical element. The alert may be issued if the measurement exceeds a pre-defined level (say 5 %.)

0309In certain cases, expected light loss due to dirty lens or optical element may be established based on the measurements deduced either by power management module 112 or measurement and verification module 170. In addition, this may be followed by actions such as overdriving the luminaire and/or re-routing the power to buffer luminaires (the luminaires that may be utilized in case the original luminaires stop working.)

0310In another embodiment, the 'dirtiness' measurement may be utilized for logging purposes for future foot and candle (ft-candle) delivery auditing.

0311Further, an interaction between the power management module 112 and each light bar may facilitate determination of individual light bar characteristics. For example, the power management module 112 may determine beam angle for one light bar, rotational position for other, and lumen output for some others. Similarly, other characteristics of the light bars, such as correlated color temperature (CCT), run hours etc. may also be determined.

0312The communication channel between power management module 112 and each light bar may be using MCU, EEPROM, or some other digital communication channel. In another case, a mechanism may be integrated into the mechanical structure (fixture frame 608) and/or light bar for sensing angular position of the light bar inside the frame. Examples of such mechanisms include encoder style code on end plate, accelerometer, and some other types of mechanisms.

0313In another embodiment, a passive encoding mechanism may be used. For example, electrical contacts with encoded bit pattern may be stored in optics holder (fixture frame 608) or passive RFID.

0314In yet other embodiments, a passive power-up modulation sensing scheme (e.g. delta-t to full current consumption) may be used enabling the PMM and LED light bar to communicate without a dedicated channel. One of the ways this could happen is for the PMM to apply full voltage to the LED light bar upon initial power-up, but intelligence onboard the LED light bar could cause the bar to consume a specific current profile over the first, say, 1 second from initial application of power. The PMM could monitor this current consumption, and analyze it to figure out what kind of LED light bar was attached. For example, given LED light bars, A and B, LED A bars could be programmed to delay 500ms before drawing full current upon initial power-up, and B bars could be programmed to draw full current immediately. The PMM then can monitor the current consumption, such as via a simple current sensor, and use a simple timer to distinguish between the two types. More complicated schemes could provide even more information about the light bars' capabilities.

0315Referring to <figref idref="f0028">Fig. 27</figref>, a power management module 2702 with light module identification is depicted. Each light module 2704 may have identifying information programmed into it, and can communicate that information to the PMM 2702, which can in turn store and communicate that information to a user or installer to aid in replacement or commissioning. The information may be stored in a nonvolatile memory onboard the light module 2704, and communicated via a digital bus to the PMM 2702. The information may be stored passively on the light module, such as via a series of jumpers or dip switches, and can be read by the PMM. The passive storage may include electrical contacts with encoded bit pattern stored in an optics holder. The passive storage may include passive RFID. The identifying information may be stored via a mechanism integrated into the housing and/or light bar for sensing angular position of the LED light bar inside the housing. The mechanism may include an encoder-style code on an end plate of the LED light bar. The mechanism may include an accelerometer disposed on the LED light bar. The identifying information may be stored via a passive power-up modulation sensing scheme, such as delta-t to full current consumption. The processor may be able to signal LED light bar type to users or operators for light bar replacement purposes. The signal may be via a tricolor LED on the LED light bar or PMM with the LED light bar type indicated via color code, via an LED on the LED light bar or PMM which blinks according to code to indicate LED light bar type, via a handheld scanner which reads encoded IR or visible light from the lighting fixture to determine type, and can be activated with laser detector or IR handshake, or via RF transmission of LED light bar types to remote diagnostic equipment.

0316In an aspect of the present invention, the power management module 112 may be designed such that they may be easily replaced and upgraded on field, e.g., environment 100. In this regard, the power management module 112 may include an auto-calibration feature. This feature may determine various electrical characteristics necessary for providing power to each light bar. Examples of electrical characteristics may include but not limited to chronological age, elapsed run time, forward voltage, optimal drive current, maximum drive current, and some other characteristics.

0317The various electrical characteristics may be stored in a nonvolatile memory onboard each light bar. Examples of the nonvolatile memory may include read-only memory, flash memory, memory in computer storage devices (hard disks, floppy disks, and magnetic tapes), optical discs, punch cards, and some other types of memory. In certain cases, there may not be a direct and continuous measurement of the electrical characteristics but determination may be made based on the previous measurements and calibrations. In some other cases, a subset of characteristics may be used to predict the other electrical characteristics. For example, determination of the run time may be linked to the chronological age of the lighting systems.

0318Referring to <figref idref="f0029">Fig. 28</figref>, a replaceable power management module with auto-configuration is depicted. The PMM 2802 uses identifying information about the light module(s) 2804 to which it is connected to configure its outputs. The PMM 2802 may have the ability to determine light module characteristics, such as operating voltage 2810, drive current 2812 [min/max/nominal], thermal constraints [max ambient], elapsed run hours 2814, and the like, and configure its own outputs to match the optimal operating parameters of the light modules 2804. The LED light bar may auto-calibrate the power input to each LED light bar based on the light module characteristics. The identifying information may be stored passively on the LED light bar and can be read by the processor. The passive storage may include electrical contacts with encoded bit pattern stored in an optics holder. The passive storage may include passive RFID. The identifying information may be stored via a mechanism integrated into the housing and/or light bar for sensing angular position of the LED light bar inside the housing. The mechanism may include an encoder-style code on an end plate of the LED light bar. The mechanism may include an accelerometer disposed on the LED light bar. The identifying information may be stored via a passive power-up modulation sensing scheme, such as delta-t to full current consumption. The processor may be able to signal LED light bar type to users or operators for light bar replacement purposes. The signal may be via a tricolor LED on the LED light bar or PMM with the LED light bar type indicated via color code, via an LED on the LED light bar or PMM which blinks according to code to indicate LED light bar type, via a handheld scanner which reads encoded IR or visible light from the lighting fixture to determine type, and can be activated with laser detector or IR handshake, or via RF transmission of LED light bar types to remote diagnostic equipment.

0319In another aspect of the present invention, the power management module 112 may include a temperature sensor. Based on the measurements from the sensor, the module 112 may adjust LED drive current. For example, in colder regions where temperature drops below zero degrees centigrade, the module 112 may adjust the drive current such that there is no irreversible damage to the lighting system.

0320In an embodiment, the temperature sensors may be located near the light bars such that the temperature is sensed directly.

0321In other embodiments, only ambient temperature (outside the fixture) may be measured and LED operating temperature extrapolated based on the previous drive current, voltage, thermal characteristics measurements (similar to predicting a characteristic based on some other characteristics, as explained earlier.)

0322It is an object of the present invention that the presented modular LED lighting systems 102 address various thermal and optical requirements of the lighting systems.

0323With regard to this, a good thermal system design ensures high efficiency and reliability of lighting systems. In an aspect of the present invention, heat dissipation systems such as heat sinks may be designed for the LED light bars. Dissipation of heat from the heat source (in the light bar) into the surrounding environment may take place through a heat sink. The entire process may be concluded in four steps. As a first step, heat is transferred from heat source to the heat sink followed by conduction from within the heat sink to its surface, then transferred from the surface into the environment. In some cases, radiation loss based on the surface of the heat sink may also take place. Conventional heat sinks may primarily be flat plate; die-cast finned type, and extruded finned type. Materials used for preparing the heat sinks may include aluminum, copper, and some other types of material. In accordance with an embodiment of the present invention, a finned heat sink may be used such that the heat sink fins are oriented perpendicular to the length of the light bar. <figref idref="f0011">Fig. 10</figref> depicts a finned heat sink 1002 associated with the light modules 604 (light bar). Fins 1004 of the heat sink 1002 are perpendicular to the length of the light module 604.

0324In accordance with another embodiment of the invention, the long edges or fins of the heat sink may be 'undercut' to facilitate additional airflow between the heat sink surface. In an embodiment, cross-sectional profile of the heat sink may be designed to perform optimally within a continuous range of rotation along the long axis of the light bar. For example, the light module 604 can be rotated 60 degrees to either side of vertical axes AA', therefore the heat sink 1002 may be constructed so as to ensure that the dissipation of heat is not affected when the light module is rotated (continuously or intermittently) to either side. Referring to <figref idref="f0030">Fig. 29</figref>, a rotatable light module 2904 with cross-cut heatsink 2902 is depicted. Orienting the fins of the heatsink perpendicular to the axis of rotation gives better airflow at all rotational angles. Undercut fins 2908 can expose even more area to airflow when bar is rotated away from vertical.

0325Various embodiments of the present invention provide methods and systems for imparting an efficient thermal management system for the lighting systems. Some of these methods have been explained below in conjunction with suitable examples.

0326An ultra low profile luminaire may be designed for direct thermal transfer into concrete or other surface material. For example, lighting systems mounted on the walls and poles of places such as parking lots, aisles, and stairs may utilize the concrete structure for dissipation of heat. Specifically, the pole-mounted luminaires may be designed to couple to a heat dissipating apparatus (a small heat sink) already existing on the mounting arm or pole to thermally transmit the heat.

0327Referring to <figref idref="f0031">Fig. 30</figref>, a flush-mount fixture 3002, such as commonly used in parking garages, may not have sufficient room for air circulation around heat sink fins. However, concrete is a reasonably good thermal conductor, so coupling the LED heat source directly to the concrete surface may provide sufficient cooling. A fixture may be designed to be flush-mounted with an exposed thermal interface pad 3004 on the side that comes in contact with the mounting surface. The thermal interface pad 3004 disposed along a surface of the fixture in contact with a mounting surface enables transfer of heat energy from the LED light bars 3008 to the mounting surface 3010. The fixture may further include a PCB 3012, a heat spreader plate 3014, and the like.

0328Referring to <figref idref="f0032">Fig. 31</figref>, a thermal design for a pole-mount fixture 3102 is depicted. Getting heat out of a sealed outdoor fixture may be a challenge. Integrating a heat pipe system 3108 where a radiator 3104 is attached to the fixture pole 3110 and the thermal transfer material flows through the fixture mounting socket may enable radiation of heat energy from the LED light bars. The radiator 3104 may be self-orienting into prevailing winds, such as a weathervane-style radiator 3112.

0329Similarly, an LED retrofit light module may be employed for outdoor luminaires that may incorporate a specific pattern of drilled-out holes 1008, as shown in <figref idref="f0011">Fig. 10</figref>, in the existing luminaire housing. This design may provide convective airflow to the retrofit module, thereby increasing dissipation of excessive heat.

0330In addition to the above design, the outdoor luminaires may also be combined with an integrated evaporative cooling element fed by rainwater or condensation, an integral solar-powered thermoelectric cooler to increase net fixture efficacy, and a heat sink that may be positioned automatically at an optimal angle to prevailing winds in order to maximize thermal dissipation.

0331Referring to <figref idref="f0033">Fig. 32</figref>, a thermal design for an LED lighting fixture may feature evaporative cooling. The LED lighting fixture 3202 may store water inside the fixture housing in an embedded water reservoir to take advantage of evaporative cooling for thermal control purposes. The water may be atmospheric water, such as captured rain water, condensation, and the like. Water may evaporate from the reservoir, thus cooling the fixture. The fixture may include an evaporative cooling element in fluid communication with the water reservoir that absorbs heat from the LED light bar and causes the evaporative cooling of the fixture.

0332In another embodiment, the luminaire may be provided with a heat converter to convert waste heat into electrical power. This may result in boosting net fixture efficacy.

0333Referring to <figref idref="f0034">Fig. 33</figref>, a fixture 3302 with waste heat harvesting to increase net fixture efficacy is depicted. Waste heat may be reclaimed from the fixture using a Sterling engine 3304 or other device to convert the waste heat into supplementary electricity. The fixture may include a circuit for directing the electrical power generated from the waste heat to a power input for the lighting fixture.

0334In yet other embodiments, a passive electrostatic forced air cooling may be used. <figref idref="f0012">Fig. 11</figref> depicts an electrostatic field being used for cooling purposes in a lighting system. The figure represents a heat sink 1002 provided with number of air ducts or holes 1102. The arrangement includes an electrical conductor with power supplies 1104 associated with an ionization element 1108. When a current is passed through the electrical conductor the ionization element (e.g. a thin metallic strip) may get charged, thereby ionizing the air surrounding it, represented by Air (i). The ionized air streams may be carried towards the air ducts or holes 1102, and further inside the heat sink 1002. The launch of the ionized air currents inside the heat sink results in an increased or forced air flow, represented by Air (f). As a result of an increased air flow through the heat sink, the net rate of dissipation of heat may be significantly increased.

0335Referring to <figref idref="f0035">Fig. 34</figref>, a thermal design for a lighting fixture 3402 may feature integrated passive electrostatic cooling using air ionizing technology 3404 to induce air flow past the heat sink fins with no moving parts. An electrostatic element may be disposed on a surface of the fixture 3402, wherein the element 3404 is charged by drawing power from the lighting fixture, and wherein the electrostatic element 3404 attracts charged air particles, causing an airflow of charged air particles through the lighting fixture 3402.

0336With regard to optical designs, a luminaire with a variable-adjustable secondary optics may be provided.

0337In an embodiment, a variable beam spread may be obtained by motion of an optical assembly corresponding to the LED plane. In other words, the optical assembly may be individually rotatable or adjustable with respect to the LED light modules 604.

0338In another embodiment, a variable center position by rotation of holographic deflector may be obtained.

0339In other embodiment, a variable asymmetric beam by rotation of holographic or volumetric diffuser may be obtained.

0340Lighting systems are easy to use when they are easily replaceable by the users. To meet this objective, a luminaire with user-replaceable optical components may be provided.

0341In an aspect of the present invention, an LED light bar or light module 604 with a secondary or tertiary optic assembly which is user replaceable in a tool less manner may be provided.

0342Alternately, and referring to <figref idref="f0044">Fig. 43</figref>, a luminaire may be provided with a self-located optic based on an LED's lens ring. This optic may be associated with the LED by means of a quarter-turn mechanism. The optic may be provided with a plurality of ramp like structures that may be molded in to the surface of the optic. The ramp structures mate to pre-existing bars on either side of the LED. The bars may be extruded into the main body of the heat sink or molded into the housing of the LED. Once the holder for the TIR optics in dropped into place along the molded ramps of the lighting fixture, the optics holder is rotated and the ramps push down and lock it into place. The downward pressure exerted by the locking enables a good thermal path without the use of fasteners.

0343Conventional LED lighting systems disclosed placing phosphor particles in close proximity to the LED chips inside the reflector cup. This method was found to negatively affect the overall luminous efficacy and lumen maintenance of the phosphor LED lighting systems. A technique of 'remote phosphor' paved the path for improved performance of lighting systems, wherein the phosphor particles 1204 were placed at a distance from the LED chips 1208, thereby introducing remote distribution inside a reflector cup 1202. In an aspect of the present invention, the remote phosphor may be integrated into holographic diffuser, volumetric diffuser, and/or waveguide in order to provide non-lambertian shaping of beam from phosphor emitting surface.

0344In an aspect of the present invention, total internal reflection and holographic diffuser may be integrated into a top surface, or bonded by means of index-matching material, in order to reduce the number of refractive boundaries by 2. Referring to <figref idref="f0042">Fig. 41A</figref>, TIR (Total Internal Reflection) optics are solid molded parts, commonly used to "beam-shape" LED light output. Referring to <figref idref="f0042">Fig. 41B</figref>, holographic diffusers, also known as light shaping diffusers, may be micro-textured sheets that can shape incoming light in asymmetric ways. For example, a laser dot may be reshaped into a stripe, or an LED circular beam may be reshaped into an ellipse. Typically, a plastic sheet, either flexible or rigid, may be printed with a special surface texture. Referring to <figref idref="f0043">Figs. 42A &amp; B</figref>, TIR optics may be combined with holographic diffusers to obtain non-standard beam patterns. A drawback of combining separate TIR and holographics is an extra layer of optical loss. Either molding the holographic texture directly into the surface of the TIR lens, or by adhering a holographic diffuser sheet to the TIR optic using a so-called "index matching" material may avoid the extra optical loss.

0345In an embodiment, LED luminaires may be designed with tight symmetric beam angles designed for low profile holographic beam shaping.

0346In another embodiment, a retrofit and customized kit or module for existing fixtures such as high intensity discharge lamps (HIDs) may be provided that may include partial up-light capabilities provided by a subset of LEDs, a reflector, and/or a diffuser element.

0347In another embodiment, luminaires with a non uniform louver grid to uniformly map ft-cd into environment may also be disclosed.

0348In an embodiment, luminaires with a non-uniform drive current of each LED may be provided to ensure uniform illumination at different subtended output angles.

0349In yet other embodiments, the luminaire may be supported by a cover lens for the optical assembly with electrostatic repulsion of dust for rough environments.

0350Apart from the above disclosed optical features, the following improvements may be made to the overall design of the lighting systems. As shown in <figref idref="f0014">Fig. 13</figref>, an extra lens or perhaps just a "mask" template 1302 with slots (slot "ABCD" shaded in 'grey') cut at the half width max may be provided with the light stacks in order to help during initial aiming of the light bars. The more defined lines of light on the floor or stacks would help to determine the exact location of the light and the cutoffs.

0351Similarly, simple laser pointer accessories 1304 which could be simply attached (with clips or magnets) to the light bars in order to show the beam center or edges may be attached to the light bars. The laser pointers 1304 may also be used to help determine whether the fixture is level since lasers could help with centering or positioning of fixture center to center from last.

0352In another embodiment, a bubble indicator may be introduced to determine fixture level.

0353Referring to <figref idref="f0036">Figs. 35A</figref>, B, &amp; C, variations of a fixture aiming apparatus are depicted. Properly positioning a fixture, such as in order to evenly distribute light, or place extra light where desired, during installation may be challenging. In order to facilitate positioning, a laser pointer accessory 3502 may snap onto the LED light bar 3504 and indicate where the LED light bar 3504 is aimed, as shown in <figref idref="f0036">Fig. 35A</figref>. Alternatively, a mask accessory 3508 may snap onto the LED light bar 3504 and sharpen the edges of the emitted light beam to more clearly indicate a region of illumination, as shown in <figref idref="f0036">Fig. 35B</figref>. In another embodiment, the fixture may include an integrated or snap-on level indicator 3510, such as the bubble level shown in <figref idref="f0036">Fig. 35C</figref>.

0354Referring to <figref idref="f0019">Fig. 18</figref>, an angle adjustment indicator 1802, such as a detent or other indicator may be useful for modular lighting systems for pre-setting angular adjustments for multiple fixtures once the optimal adjustments have been determined. The light bars or the fixture housing may be provided with a visual scale of degrees, numbers, spring loaded detents, and some other similar features which may designate the angular adjustments of the light bar. Once an angle may be selected, it may be locked into place.

0355Alternately, for determination of angle of illumination for the light bar, a calculator may be employed based on several factors such as ceiling or wall height, fixture spacing, ambient temperature, and some other factors. This angle calculator may be localized or may be online to be accessed through a network. The calculator may include provisions for obtaining printed copies of the various light bar angles corresponding to the factors, which may be later used to make an appropriate selection by the users.

0356Additional features may include integrating 'blinking' LEDs in the lighting systems to show network connectivity and/or light bar status.

0357In an embodiment, a downward aimed status LED may be used.

0358In other embodiments, light bars may themselves blink to display the status information. For example, in a manufacturing plant, a light bar may blink continuously to indicate an emergency situation, or may blink after a certain period (say 10 seconds) to indicate loading operation in process.

0359In yet other embodiments, lighting systems connected through a wireless network 142 may also utilize a handheld device such as a PDA or smart-phone to display the light bar status information.

0360Lighting systems in a network 142, as explained in conjunction with <figref idref="f0002">Fig. 1b</figref> earlier, may also employ cooperative sensor networking. In this scenario, there may not be a centralized light management unit, but the control and management would be propagated through the network 142, preferably a mesh network. Accordingly, the control or response signals from the sensors may be transmitted through the mesh network, and lighting fixtures may respond to these signals according to a predefined rule. As mentioned earlier, there may be a directory of such predefined rules stored in a fixture memory, or these rules may be stored inside various modules of management systems 134.

0361Referring to <figref idref="f0037">Fig. 36</figref>, in an embodiment of cooperative sensor networking, networked lighting fixtures and sensors with no centralized control device are depicted communicating with one another via a mesh network 3604 topology. The mesh network 3604 may be wireless or carried on a powerline. The fixtures may include a mesh network connection, integrated sensor(s), and an internal rule database. Sensor data may be shared from fixture-to-fixture via the mesh network, and the fixtures may independently act on sensor data based on the rules stored in a fixture memory. As in <figref idref="f0037">Fig. 36</figref>, a plurality of networked lighting fixtures are disposed in an area organized by aisles with intervening racks 3610. The circled fixture 3602 may sense occupancy via an occupancy sensor. The sensor signal may then be broadcast to the entire mesh network 3604. The neighboring fixtures 3608 receiving the sensor signal see that it is from their aisle and they turn on in response to the signal. Therefore, at least one sensor is integrated in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures. The lighting fixtures are further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures. When a sensor data signal is received by a lighting fixture, a built-in processor processes the sensor data signal and transmits a control command to the lighting fixture in accordance with at least one rule stored in a memory of the processor.

0362As discussed earlier, the lighting management systems may utilize agreed upon parameters (such as lighting parameters 202, energy demand parameters 212, and utility energy demand parameters 302) for managing lighting systems including any of the lighting fixtures described herein as well as lighting fixtures not described herein. Consider a stage being illuminated by numerous lights equipped with sensors 120. Any change in the pattern of utilization of these lights may be detected by the sensors 120 and reported to the management systems 134. The management system 134 may automatically configure the lights based on a set of agreed upon parameters or rules. For example, the rate of thermal dissipation may be increased by increasing air flow in case increase in voltage is reported due to a light fuse. Therefore, in this case the agreed upon parameter is the increase in voltage.

0363In another embodiment, luminaires may broadcast unique identifiers (ID) as part of normal beam. Users or commissioners may use handheld devices that decode IDs and may communicate this to management systems 134. Alternately, the commissioner may select a ft-cd level and traverse facility or lighting system such that the luminaires and light management systems may automatically adjust output to match desired levels.

0364Examples of some handheld commissioning tools may include PDA, handheld mobile phones, smart-phones, purpose built hardware commissioning tools (e.g., Zapi), and some other types of tools.

0365For the installation and commissioning process, software commissioning tools may also be utilized. In an embodiment, the software commissioning tool may be a web-based or application client. In another embodiment, the commissioning tool may be run through a server for the management systems 134. The server may be distributed or remotely located.

0366With regard to network connectivity, various embodiments and solutions may be disclosed that may also benefit the installation and commissioning process. Larger areas and environments that may require a number of lighting units may sometimes leave the operators carrying out the commissioning process perplexed. In view of this, solutions to automatically build or construct a 'connectivity map' of the entire environment or facility (e.g., warehouse facility) may be provided. These solutions may be either in the form of software or designing tools that may help the users in building a logical yet simple map or graph of the facility in which fixtures may be depicted as nodes. The overlapping or contiguous beam patterns of the two fixtures may be depicted by an edge connecting them. On the same note, different symbols and codes may be used for constructing these 'connectivity maps.'

0367In an embodiment, the connectivity map may be automatically generated from a combination of mesh routing and Received Signal Strength Indication (RSSI) data. The RSSI may provide a measurement of the power present in a received radio signal. Preferably implemented in a wireless network, the RSSI data will indicate the strength of the signal. On a graph, a solid line (composed of RSSI measured values) will indicate a strong signal and a flashing or spliced line may indicate a weak signal. This information would aid the installation and commissioning process by indicating which nodes in the facility correspond to strongest or weakest signals.

0368Referring to <figref idref="f0038">Fig. 37</figref>, depicts automated commissioning via a mesh network 3604. Being able to automatically build a "map" of an installation may shorten commissioning time. Automated commissioning may use characteristics of the fixture-to-fixture mesh network 3604, such as the hop count from one node (lighting fixture) to another, and the RSSI or signal strength for any particular hop to construct the network topology. Fixture placement may be automatically deduced using the performance characteristics of the mesh network 3604. As shown in <figref idref="f0038">Fig. 37</figref>, the first step in automated commissioning may begin with a fixture, such as the circled fixture 3702, querying the mesh network 3604 for neighboring fixtures by sending out a query signal. In the second step, hop counts to neighboring fixtures are determined -- the rectangled fixtures 3704, 3708 may be reached in a single wireless hop, so they are potentially neighbors. In the third step, the fixtures with the greatest signal strength are determined -- the shaded rectangles 3704 have the highest RSSI (signal strength), so they are the circled fixture's 3702 closest neighbors. To continue building the network topology, the three steps are repeated. Thus, automated commissioning via a mesh network 3604 includes integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, collecting performance data relating to the network of lighting fixtures, wherein the performance data are at least one of sensor data signal strength and the hop count of a sensor data signal from one lighting fixture to another, and generating a representation of the network of lighting fixtures based upon the lighting fixture placement and the network performance data. The representation may be used to construct a rule database stored on at least one lighting fixture or in a centralized network controller. The representation may be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the fixtures without sensors should receive sensor data signals.

0369Referring to <figref idref="f0039">Fig. 38</figref>, automated commissioning via neighbor detection is depicted. Being able to automatically build a "map" of an installation of lighting fixtures shortens commissioning time. If fixtures can emit unique identifying signals, such as via IR beacon, RF module, or just blinking light bars in a special pattern, and also detect signals from other fixtures, a connectivity map may be iteratively built up by repeated use of these features. Automated commissioning via neighbor detection is enabled by lighting fixtures with the ability to emit unique identifying signal and ability to detect same from other fixtures, used to automatically generate topological "map" of an installation of lighting fixtures. As shown in <figref idref="f0039">Fig. 38</figref>, the first step in automated commissioning may begin with a fixture, such as the circled fixture 3802, transmitting an identifying signal. In the second step, the shaded rectangles 3804 detect the circled fixture's 3802 identifying signal, so they know they are neighbors of the circled fixture 3802. To continue building the network topology, the two steps are repeated. Thus, a method of automatically mapping a network of lighting fixtures may include integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, wherein the sensor data signal comprises a unique identifying signal, and generating a representation of the network of lighting fixtures based upon the detection of transmitted unique identifying signals by at least one neighboring lighting fixture of the transmitting lighting fixture. The representation may be used to construct a rule database stored on at least one lighting fixture or in a centralized network controller. The representation may be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the fixtures without sensors should receive sensor data signals.

0370In an embodiment, the connectivity map may be presented to the users through a configuration tool. Alternately, the map may be used to construct rule data stored in the fixtures or in a central light management module 148.

0371Various relationships between sensors and fixtures; fixtures and fixtures; and sensors and sensors may be represented on the connectivity map with the help of plurality of overlays and additional layers.

0372In other embodiments, maps may also include wide angle light sensors and network corresponding to each lighting fixture. Information regarding the neighbors for each fixture may be utilized to construct the map.

0373In accordance with other embodiments, connectivity maps may be manually built by illuminating each fixture in sequence and instructing the user to manually select neighboring fixtures. A connectivity map is a diagram showing nodes (LED lighting fixtures, in this case) and edges (links to neighboring fixtures, in this case) which may enable automatically mapping out the LED lighting fixtures in a space. For example, from a series of light fixtures, the fixture with the lowest MAC address, MAC address which is a globally unique network address used to identify network nodes (fixtures), may be illuminated first followed by a manual selection of neighboring fixtures using a laser or remote at a sensor embedded in the fixture.

0374Each fixture and/or sensor can be assigned to one or more "zones" pre-installation, then fixtures and sensors in the same zone work together In another embodiment, each lighting fixture and/or sensor may be assigned to one or more zones prior to installation and commissioning. Subsequently, all the fixtures and sensors in a specific zone may work. In addition, all the fixtures may be controlled together. Though the fixtures may belong to one or more zones, they may act based on multiple inputs corresponding to various zones. For example, a fixture may be responsible for providing illumination in zone A (e.g. a loading section of a warehouse) as well as warning signals in case of emergency in zone B (e.g. a storage section of a warehouse.) Therefore, it may receive and act upon two different inputs (increasing the illumination for zone A and initiating LED (red light) blinking in case of fire for zone B) simultaneously. The various ways in which fixtures and sensors may be categorized into zones and controlled may be achieved by various methods such as use of manual/physical means (DIP switches) and use of bench configuration processes. Bench configuration processes are the configuration steps which may be undertaken prior to installing LED lighting fixtures "on the workbench", as it were, versus while hanging in the air. In other embodiments, the categorization may be an interactive zone configuration, similar to a real world.

0375In an embodiment, the zones may be defined based on types of fixtures. For example, in a playground floodlight fixtures may be assigned one zone and background lights another.

0376In another embodiment, zones may be defined based on fixture location. Considering the playground example again, the fixtures on the field may belong to zone A (also categorized as hot zone) and the fixtures in the audience arena may be classified in zone B (soft zone.)

0377In other embodiments, zones may be categorized based on electrical circuit. For example, corresponding to ring circuits, radial circuits, series and parallel circuits, and some other types of circuits, different zones of lighting may be formed.

0378In yet other embodiment, zones may be defined based on architectural drawings and electrical plots. In some cases, these zones may be categorized based on the arrangement of fixtures illustrated in the 'connectivity map.'

0379Referring to <figref idref="f0040">Fig. 39</figref>, automated commissioning via an interactive procedure is depicted. Being able to automatically build a map of an installation of lighting fixtures may shorten commissioning time. In a more manual version of the process for commissioning, a user may interactively select neighbors of each fixture using some remote selection mechanism, such as a laser pointer with a detector on the fixture or LED light bar, a remote control with an IR detector on the fixture or LED light bar, and the like, with the neighbor information then used to automatically build a network topology. As shown in <figref idref="f0040">Fig. 39</figref>, the first step in commissioning may begin with a user identifying a fixture's, such as the circled fixture's 3902, neighbors. In the second step, the user may step through a list of all detected fixtures in the network 3604 until the circled fixture 3902 is selected. In the third step, the user may then manually select the shaded fixtures 3904 as neighbors. To continue building the network topology, the three steps are repeated. Thus, a method of mapping a network of lighting fixtures may include integrating at least one sensor in at least one of the plurality of lighting fixtures, wherein each of the plurality of lighting fixtures are configured to receive a sensor data signal from one of the plurality of lighting fixtures or an outside source and transmit a sensor data signal to at least one other of the plurality of lighting fixtures and further configured to receive a sensor data signal transmitted by one of the other lighting fixtures and transmit a repeated sensor data signal to at least one other of the plurality of lighting fixtures, selecting neighbors of each lighting fixture by detecting a sensor data signal transmitted to at least one lighting fixture from an outside source, wherein the sensor data signal comprises neighbor information, and generating a representation of the network of lighting fixtures based upon the detection of transmitted sensor data signals from the outside source. The representation may be used to construct a rule database stored on at least one lighting fixture or in a centralized network controller. The representation may be used to automatically assign lighting fixtures to zones. The representation may be used to automatically determine from which lighting fixtures' sensors the fixtures without sensors should receive sensor data signals.

0380Similarly, decrease in the light output resulting from failure of a single fixture or a part of fixture may be avoided in a network with use of cooperative failure compensation. When a fixture fails in a network, this may be detected or sensed by the neighboring fixtures either through sensors located onboard or by notification received over the network 142. As a result, the remaining fixtures may increase their light levels to maintain the desired light on surfaces. This application may be highly relevant and useful for the environments such as theater stages, performance grounds, manufacturing units, mining holes, and similar other areas where receiving constant light output may be pertinent.

0381Referring to <figref idref="f0041">Figs. 40A &amp; B</figref>, cooperative failure compensation is depicted. Neighboring fixtures may have overlapping beam patterns. Once a connectivity map identifying the position of each fixture is obtained, such as by any of the methods described herein, the network may compensate for partial failure (i.e. a dead light bar) by temporarily overdriving a neighboring fixture, as identified on the connectivity map. LED light bar failures may be identified via light sensors, onboard error detection, and the like. Neighboring fixtures can temporarily increase their light output to at least partially compensate for this loss of light. In <figref idref="f0041">Fig. 40A</figref>, all of the LED light bars are operating at 100%. However, in <figref idref="f0041">Fig. 40B</figref>, one of the LED light bars 4004 is dead. A neighboring fixture 4002, as determined based on a connectivity map, may be overdriven to compensate for the failure. When one fixture or part of a fixture fails, neighboring fixtures detect this (via sensing onboard or via notification over network) and increase their light level to maintain desired light on surfaces. An associated PMM can intelligently detect the presence of a dead light bar by sequencing through output channels and detecting power consumption at each step.

0382Similar to the aspect of intelligent commissioning of lighting systems, another improvement in the design of modular lighting systems may include advanced dimming and sensing capabilities. For example, luminaires may be dimmed based on command input from multiple sources. In an embodiment, the commands from the multiple sources may be combined into a single command value by the light management systems 118 or power management systems 112 inside the luminaire.

0383In an embodiment, the combined command values may be stored in a remote database or inside the fixture as decision weights. Similarly, different decision profiles may be created and supported based on certain operating conditions. For example, for an operating condition 'full-throttle', commands from sources A, B, and C are always combined together to initiate an action from the management systems. This action may be stored as a rule or decision inside the fixture or in a remote memory.

0384Referring to <figref idref="f0020">Figs. 19A and B</figref>, a fixture with individual light bar dimming is depicted to achieve fine-grain control over spatial light distribution. <figref idref="f0020">Fig. 19A</figref> depicts a fixture made up of light bars 1902 each illuminating a different portion of an environment, where the light bars can be individually dimmed to change the distribution of light, or beam pattern, in the environment. <figref idref="f0020">Fig. 19B</figref> depicts dimming of two of the three LED light bars 1904 without dimming the third LED light bar 1902. Dimming may be via multiple independent drivers where each light bar has its own driver. Dimming may be via a single driver where the LED light bars are connected serially, and a controllable shunt across each bar allows for individual control. A method for altering an aggregate beam pattern may include electrically connecting a driver circuit to a variable light intensity LED light bar for controlling a variable load applied to the LED light bar, wherein the luminous output of the LED light bar is varied in response to a change in the load. At least one of the plurality of light bars may include a rotational drive constructed and arranged to rotate the at least one LED light bar along at least one rotational axis independent of the orientation of the housing, or the LED light bar may be freely rotatable.

0385Conventional lighting systems employing traditional occupancy sensors may have unacceptable error rates. Therefore, a multi-observer mesh of sensors may be created to meet advanced sensing capabilities. This consequently may establish a voting procedure to increase recognition accuracy. For example, in highly active zones such as a highway, there is a negligible room for errors. Therefore, in such a scenario, the environment 100 will be provided by a mesh of sensors situated at various locations that may or may not report the same incident or change. The management and control systems in this case will utilize the information received from all the sensors and may determine the number of 'like' instances. As a result, the final decision or action will be based on the number of votes or instances reported.

0386In other embodiments, luminaire runtime may be monitored by the lighting management systems to estimate/calculate 'end-of-lives' for the luminaires. This information may be presented to the user as a notification for initiating suitable action. The alerts may also be issued at pre-determined intervals (e.g. 10 hours) to estimate end-of-life.

0387In an embodiment, a set of rules may be defined for initiating alerts. These rules may be stored in rules databases in the management systems 134. For example, in the above case alert may be issued to notify 'end-of-life' of the luminaire or variable voltage input.

0388In another embodiment, alert procedures may be defined. For example, in some cases, a simple visual alert in the form of blinking LED notifying low battery condition for storage device may be sufficient. In some other cases, such as emergency (fire) LED blinking followed by alarm through-out the premises may be required to notify the users. In yet other cases, the alert may be initially transmitted to an operator interface, who will subsequently relay the information to a zone manager. These are only exemplary instances, and more may be defined based on the requirements of the environment and the system. Whatever be the case, a definite process may be designed. This process may be embedded as a set of mutual guidelines or internal rules in the lighting systems 102.

0389Similarly, various alert system gateways may be engaged for issuing notifications such as e-mail interface, web-based interface (instant messaging, twitter, etc.), pager interface, cell phone interface, audio, visual, and some other types of interfaces.

0390When ambient light is detected in an environment, luminaire brightness may be reduced in that environment in order to reduce system power consumption while maintaining desired light levels. The ambient light may be detected by means of sensors in wireless remote unit, to be placed directly into operating environment.

0391Alternately, the ambient sensors may be integrated into the luminaires such that they have an 'aimable or reachable' mount aligned with windows, skylights, and other utilities in the environment 100.

0392Smart PMMs may have an onboard non-linear mapping of ambient reading into implied "true" ambient values, generated by initial calibration or pre-loaded. For various reasons, the readings coming from standard light sensor modules may not correspond linearly with actual light in the environment, so having the ability to correct for this non-linearity onboard the PMM using ambient light sensors may allow for more accurate readings.

0393Therefore, it may be observed that the lighting systems may be controlled based on various factors such as business rules, user controls and commands, zone rules, third-party commands, sensor inputs, electricity price levels as functions of time, daylight levels, and some other factors.

0394By analyzing past patterns of sensor data, light management systems may make predictive decisions that can reduce overall energy consumption or optimize some process. For example, if a system observes that a particular warehouse aisle is accessed very infrequently, the ambient lighting level of that aisle may be lowered in order to save costs.

0395The above sensor data may be compiled for use by a lighting control system (for example, in order to reduce costs or increase safety) or exported for use by some other system (such as a warehouse inventory management system, parking garage management system, security system, and so on.)

0396The prediction or forecasting may be performed by lighting prediction and management module 152 to determine better layouts for plants. The forecasting may be cyclical or seasonal in nature or both. The system may compile data with a purpose to rearrange and find optimal layouts for warehousing (such as stacks and fixtures.) In addition, based on the SKUs and inventory levels, new locations may be suggested for SKU placement.

0397In addition to the above mentioned features, there may be certain additional characteristics that may be incorporated in the designs of modular lighting systems. The following embodiments describe various representations where light may be utilized as a utility.

0398In accordance with an embodiment of the present invention, an integrated RTC/Astro clock with the power management module of the lighting systems to provide intelligent dusk-dawn dimming may be disclosed. This may be specifically useful for outdoor areas. Referring to <figref idref="f0016">Fig. 15</figref>, an outdoor facility such as a badminton court 1500 may be illustrated. LED lamps 1502 and pole lights 1504 may be equipped with sensors 120. As soon as the sensors 120 detect a decrease in the intensity of ambient light (due to evening or night vision or change in weather conditions), the lights 1502 and 1504 may be instantly illuminated.

0399Intelligent sensing may be useful in other outdoor environments including roads and highways 1604 as well. Referring to <figref idref="f0017">Fig. 16</figref>, wireless sensors 120 may be embedded into the luminaires 1602 associated with the vehicles 1600 and wireless ID (such as cell ID, Bluetooth or WiFi ID) associated with the passing vehicles 1600 may be logged for advertising purposes.

0400In another embodiment, a vehicle sensor 120 may be embedded into the luminaire 1602 to compile traffic information (obstructions, jams, etc.)

0401In a nutshell, various embodiments of the present invention provide modular designs of the lighting systems with features that may be useful for a variety of environments such as warehouse, manufacturing facility, parking garages, street lighting, prisons, gymnasiums, indoor pools, stadiums, bridges, tunnels, and some other types of environments.

0402The methods and systems described herein may be deployed in part or in whole through a machine that executes computer software, program codes, and/or instructions on a processor. The processor may be part of a server, client, network infrastructure, mobile computing platform, stationary computing platform, or other computing platform. A processor may be any kind of computational or processing device capable of executing program instructions, codes, binary instructions and the like. The processor may be or include a signal processor, digital processor, embedded processor, microprocessor or any variant such as a co-processor (math co-processor, graphic co-processor, communication co-processor and the like) and the like that may directly or indirectly facilitate execution of program code or program instructions stored thereon. In addition, the processor may enable execution of multiple programs, threads, and codes. The threads may be executed simultaneously to enhance the performance of the processor and to facilitate simultaneous operations of the application. By way of implementation, methods, program codes, program instructions and the like described herein may be implemented in one or more thread. The thread may spawn other threads that may have assigned priorities associated with them; the processor may execute these threads based on priority or any other order based on instructions provided in the program code. The processor may include memory that stores methods, codes, instructions and programs as described herein and elsewhere. The processor may access a storage medium through an interface that may store methods, codes, and instructions as described herein and elsewhere. The storage medium associated with the processor for storing methods, programs, codes, program instructions or other type of instructions capable of being executed by the computing or processing device may include but may not be limited to one or more of a CD-ROM, DVD, memory, hard disk, flash drive, RAM, ROM, cache and the like.

0403A processor may include one or more cores that may enhance speed and performance of a multiprocessor. In embodiments, the process may be a dual core processor, quad core processors, other chip-level multiprocessor and the like that combine two or more independent cores (called a die).

0404The methods and systems described herein may be deployed in part or in whole through a machine that executes computer software on a server, client, firewall, gateway, hub, router, or other such computer and/or networking hardware. The software program may be associated with a server that may include a file server, print server, domain server, internet server, intranet server and other variants such as secondary server, host server, distributed server and the like. The server may include one or more of memories, processors, computer readable media, storage media, ports (physical and virtual), communication devices, and interfaces capable of accessing other servers, clients, machines, and devices through a wired or a wireless medium, and the like. The methods, programs or codes as described herein and elsewhere may be executed by the server. In addition, other devices required for execution of methods as described in this application may be considered as a part of the infrastructure associated with the server.

0405The server may provide an interface to other devices including, without limitation, clients, other servers, printers, database servers, print servers, file servers, communication servers, distributed servers and the like. Additionally, this coupling and/or connection may facilitate remote execution of program across the network. The networking of some or all of these devices may facilitate parallel processing of a program or method at one or more location without deviating from the scope of the invention. In addition, any of the devices attached to the server through an interface may include at least one storage medium capable of storing methods, programs, code and/or instructions. A central repository may provide program instructions to be executed on different devices. In this implementation, the remote repository may act as a storage medium for program code, instructions, and programs.

0406The software program may be associated with a client that may include a file client, print client, domain client, internet client, intranet client and other variants such as secondary client, host client, distributed client and the like. The client may include one or more of memories, processors, computer readable media, storage media, ports (physical and virtual), communication devices, and interfaces capable of accessing other clients, servers, machines, and devices through a wired or a wireless medium, and the like. The methods, programs or codes as described herein and elsewhere may be executed by the client. In addition, other devices required for execution of methods as described in this application may be considered as a part of the infrastructure associated with the client.

0407The client may provide an interface to other devices including, without limitation, servers, other clients, printers, database servers, print servers, file servers, communication servers, distributed servers and the like. Additionally, this coupling and/or connection may facilitate remote execution of program across the network. The networking of some or all of these devices may facilitate parallel processing of a program or method at one or more location without deviating from the scope of the invention. In addition, any of the devices attached to the client through an interface may include at least one storage medium capable of storing methods, programs, applications, code and/or instructions. A central repository may provide program instructions to be executed on different devices. In this implementation, the remote repository may act as a storage medium for program code, instructions, and programs.

0408The methods and systems described herein may be deployed in part or in whole through network infrastructures. The network infrastructure may include elements such as computing devices, servers, routers, hubs, firewalls, clients, personal computers, communication devices, routing devices and other active and passive devices, modules and/or components as known in the art. The computing and/or non-computing device(s) associated with the network infrastructure may include, apart from other components, a storage medium such as flash memory, buffer, stack, RAM, ROM and the like. The processes, methods, program codes, instructions described herein and elsewhere may be executed by one or more of the network infrastructural elements.

0409The methods, program codes, and instructions described herein and elsewhere may be implemented on a cellular network having multiple cells. The cellular network may either be frequency division multiple access (FDMA) network or code division multiple access (CDMA) network. The cellular network may include mobile devices, cell sites, base stations, repeaters, antennas, towers, and the like. The cell network may be a GSM, GPRS, 3G, EVDO, mesh, or other networks types.

0410The methods, programs codes, and instructions described herein and elsewhere may be implemented on or through mobile devices. The mobile devices may include navigation devices, cell phones, mobile phones, mobile personal digital assistants, laptops, palmtops, netbooks, pagers, electronic books readers, music players and the like. These devices may include, apart from other components, a storage medium such as a flash memory, buffer, RAM, ROM and one or more computing devices. The computing devices associated with mobile devices may be enabled to execute program codes, methods, and instructions stored thereon. Alternatively, the mobile devices may be configured to execute instructions in collaboration with other devices. The mobile devices may communicate with base stations interfaced with servers and configured to execute program codes. The mobile devices may communicate on a peer to peer network, mesh network, or other communications network. The program code may be stored on the storage medium associated with the server and executed by a computing device embedded within the server. The base station may include a computing device and a storage medium. The storage device may store program codes and instructions executed by the computing devices associated with the base station.

0411The computer software, program codes, and/or instructions may be stored and/or accessed on machine readable media that may include: computer components, devices, and recording media that retain digital data used for computing for some interval of time; semiconductor storage known as random access memory (RAM); mass storage typically for more permanent storage, such as optical discs, forms of magnetic storage like hard disks, tapes, drums, cards and other types; processor registers, cache memory, volatile memory, non-volatile memory; optical storage such as CD, DVD; removable media such as flash memory (e.g. USB sticks or keys), floppy disks, magnetic tape, paper tape, punch cards, standalone RAM disks, Zip drives, removable mass storage, off-line, and the like; other computer memory such as dynamic memory, static memory, read/write storage, mutable storage, read only, random access, sequential access, location addressable, file addressable, content addressable, network attached storage, storage area network, bar codes, magnetic ink, and the like.

0412The methods and systems described herein may transform physical and/or or intangible items from one state to another. The methods and systems described herein may also transform data representing physical and/or intangible items from one state to another.

0413The elements described and depicted herein, including in flow charts and block diagrams throughout the figures, imply logical boundaries between the elements. However, according to software or hardware engineering practices, the depicted elements and the functions thereof may be implemented on machines through computer executable media having a processor capable of executing program instructions stored thereon as a monolithic software structure, as standalone software modules, or as modules that employ external routines, code, services, and so forth, or any combination of these, and all such implementations may be within the scope of the present disclosure. Examples of such machines may include, but may not be limited to, personal digital assistants, laptops, personal computers, mobile phones, other handheld computing devices, medical equipment, wired or wireless communication devices, transducers, chips, calculators, satellites, tablet PCs, electronic books, gadgets, electronic devices, devices having artificial intelligence, computing devices, networking equipments, servers, routers and the like. Furthermore, the elements depicted in the flow chart and block diagrams or any other logical component may be implemented on a machine capable of executing program instructions. Thus, while the foregoing drawings and descriptions set forth functional aspects of the disclosed systems, no particular arrangement of software for implementing these functional aspects should be inferred from these descriptions unless explicitly stated or otherwise clear from the context. Similarly, it will be appreciated that the various steps identified and described above may be varied, and that the order of steps may be adapted to particular applications of the techniques disclosed herein. All such variations and modifications are intended to fall within the scope of this disclosure. As such, the depiction and/or description of an order for various steps should not be understood to require a particular order of execution for those steps, unless required by a particular application, or explicitly stated or otherwise clear from the context.

0414The methods and/or processes described above, and steps thereof, may be realized in hardware, software or any combination of hardware and software suitable for a particular application. The hardware may include a general purpose computer and/or dedicated computing device or specific computing device or particular aspect or component of a specific computing device. The processes may be realized in one or more microprocessors, microcontrollers, embedded microcontrollers, programmable digital signal processors or other programmable device, along with internal and/or external memory. The processes may also, or instead, be embodied in an application specific integrated circuit, a programmable gate array, programmable array logic, or any other device or combination of devices that may be configured to process electronic signals. It will further be appreciated that one or more of the processes may be realized as a computer executable code capable of being executed on a machine readable medium.

0415The computer executable code may be created using a structured programming language such as C, an object oriented programming language such as C++, or any other high-level or low-level programming language (including assembly languages, hardware description languages, and database programming languages and technologies) that may be stored, compiled or interpreted to run on one of the above devices, as well as heterogeneous combinations of processors, processor architectures, or combinations of different hardware and software, or any other machine capable of executing program instructions.

0416Thus, in one aspect, each method described above and combinations thereof may be embodied in computer executable code that, when executing on one or more computing devices, performs the steps thereof. In another aspect, the methods may be embodied in systems that perform the steps thereof, and may be distributed across devices in a number of ways, or all of the functionality may be integrated into a dedicated, standalone device or other hardware. In another aspect, the means for performing the steps associated with the processes described above may include any of the hardware and/or software described above. All such permutations and combinations are intended to fall within the scope of the present disclosure.

0417While the invention has been disclosed in connection with the preferred embodiments shown and described in detail, various modifications and improvements thereon will become readily apparent to those skilled in the art. Accordingly, the spirit and scope of the present invention is not to be limited by the foregoing examples, but is to be understood in the broadest sense allowable by law.

0418All documents referenced herein are hereby incorporated by reference.

0419<b>Embodiments of the invention are set out in the following clauses:</b><ol id="ol0001" compact="compact"><li>1. A lighting fixture, comprising: <ul id="ul0002" list-style="none" compact="compact"><li>an LED lighting system mounted within a housing; and</li><li>a power management module comprising multiple sources of power input and a processor in electrical communication with the LED lighting system;</li><li>wherein the processor is arranged to receive information about the impact of consuming power from each of the sources of input power, combine the impact information via an arbitration algorithm, and select which power input to utilize based on the output of the algorithm in accordance with at least one rule stored in a memory of the processor.</li></ul></li><li>2. The fixture of clause 1, wherein at least one of the sources of input power is an energy storage device connected directly to one or more lighting fixtures.</li><li>3. The fixture of clause 2, wherein the energy storage device is a battery.</li><li>4. The fixture of clause 2, wherein the energy storage device is an ultracapacitor.</li><li>5. The fixture of clause 1, wherein the information is at least one of price per kWh, amount of kWh remaining in a storage device, and instantaneous power available from a renewable energy source.</li><li>6. The fixture of clause 1, wherein at least one of a plurality of LED light bars of the LED lighting system is arranged to rotate along at least one rotational axis independent of the orientation of the housing.</li><li>7. The fixture of clause 6, wherein the rotatable LED light bar is arranged in the lighting fixture such that it is used to change the aggregate beam angle of light emitted from the lighting fixture when its angle of rotation is substantially changed.</li><li>8. The fixture of clause 1, further comprising, an enclosure within the housing for disposing at least one sensor module, wherein the sensor module is in electrical communication with at least one of a plurality of LED light bars of the LED lighting system, wherein the surface of a sensor module lens is arranged to be close to a bottom plane of the fixture to achieve a maximum of sensor input angles.</li><li>9. The fixture of clause 6, further comprising, an angle indicator disposed on at least one of the LED light bar and the housing for indicating an angular adjustment of the LED light bar.</li><li>10. The fixture of clause 1, wherein at least one of a plurality of LED light bars of the LED lighting system is a variable light intensity LED light bar.</li><li>11. The fixture of clause 10, further comprising, electrically connecting a driver circuit to the variable light intensity LED light bar for controlling a variable load applied to the at least one LED light bar, wherein the luminous output of the at least one LED light bar is varied in response to a change in the load.</li><li>12. The fixture of clause 1, wherein the processor is further arranged to receive and process multiple sources of input data and adjust an LED lighting system parameter in response to the data in accordance with at least one rule stored in a memory of the processor.</li><li>13. The fixture of clause 12, wherein the rule determines a weight to apply to each of the input signals, combines those weighted signals via an arbitration algorithm, and determines the adjustment to the LED lighting system parameter according to the output of the algorithm.</li><li>14. The fixture of clause 1, wherein the power management module provides DC power and bidirectional data communication to a plurality of sensors of one or more lighting fixtures along at least two data conductors.</li><li>15. The fixture of clause 1, wherein the processor is arranged to communicate with at least one of a plurality of LED light bars of the lighting system to obtain identifying information about the LED light bar and store the identifying information in a memory of the processor in a form accessible by a user of the lighting fixture.</li><li>16. The fixture of clause 1, further comprising, a heatsink disposed on the housing, wherein the fins of the heatsink are oriented perpendicular to an axis of rotation of an LED light bar of the lighting system.</li><li>17. The fixture of clause 1, further comprising, a thermal interface pad disposed along an upper surface of the housing in contact with a mounting surface, wherein the thermal interface pad enables transfer of heat energy from the LED lighting system to the mounting surface.</li><li>18. The fixture of clause 1, further comprising, a heat pipe system integrated with the fixture, wherein the heat pipe system comprises a radiator attached to a pole for mounting the fixture and a thermal transfer material flowing between the radiator and the heat pipe system within the fixture.</li><li>19. The fixture of clause 1, further comprising, a waste heat recovery facility disposed within the housing for converting waste heat from the LED lighting system to electrical power, and a circuit for directing the electrical power generated from the waste heat to a power input for the lighting fixture.</li><li>20. The fixture of clause 1, further comprising, an electrostatic element disposed on a surface of the housing, wherein the element is charged by drawing power from the lighting fixture, wherein the electrostatic element attracts charged air particles, causing an airflow of charged air particles through the lighting fixture.</li></ol>