Patent ID: 7515128

Claim:
A method of controlling at least one LED-based lighting unit for generating multi-colored light or variable color temperature white light, the method comprising an act of A) generating from the at least one LED-based lighting unit two different colors or color temperatures of the multi-colored light or variable color temperature white light, over a significant range of different saturations or different color temperatures, with an essentially constant perceived brightness, wherein the act A) comprises acts of: B) generating first light having a first color or a first color temperature based at least in part on a first lighting command, the first lighting command representing at least a prescribed first luminance for the first light; C) generating second light, having a second color different from the first color or a second color temperature different from the first color temperature, based at least in part on a second lighting command, the second lighting command representing at least a prescribed second luminance for the second light, wherein the prescribed second luminance is the same as the prescribed first luminance; and D) modifying at least one of the first lighting command and the second lighting command such that a perceived first brightness of the first light is essentially identical to a perceived second brightness of the second light.