Patent ID: 10624189

Abstract:
A controller provides power to (i) a first light-emitting device that emits a first white light of a first correlated color temperature (CCT) and (ii) a second light-emitting device that emits a second white light of a second CCT lower than the first CCT. The first and second white lights mix to yield a combined white light having a combined-light CCT with a combined-light brightness. The controller receives electrical supply power in the form of segments of power. The controller distributes the supply power to the first and second light-emitting devices according to a power-distribution scheme that differentiates between whether segment duration of the segments is in an upper range or a lower range such that: (i) throughout the upper range: as segment duration decreases, combined-light CCT decreases and combined-light brightness remains substantially constant, and (ii) throughout the lower range: as the segment duration decreases, combined-light brightness decreases.