Illumination assembly with enhanced thermal conductivity

The lighting device comprises a substrate, a substrate with a electrically insulating layer (40) isolation first conductive layer and second conductive layer (32,36). The insulating layer (40) comprises a load with a thermal conductive particles (42) polymer material. Heat conductive particles (42) at least a part of the touch the first conductive layer and second conductive layer (32,36). Plurality of light source for of LED (20) or the minitype light source preferably shape, wherein the first conductive layer (32) is.