Method for controlling the alertness of a human subject and a light source for use in this method

The invention relates to for controlling is examined a person of vigilance method and light source is the method and method for light source. The method includes, wherein the protective examined made of protective of the period of the lower light radiation, and drawing the back end of black hormone circulation not higher with a remarkable force. Wherein the back black hormone of the sleeping hormone, which can be used to control examined of a person of vigilance. The telescopic light radiation is a drawing pressing black hormone suppressant radiating (is drawn back and Suwat black/fixed on the output percentage and luminous efficiency (wall/fixed regulated space); the adjusting the output percentage and luminous efficiency in turn to obtain and phase of the steps at the effect.