Patent ID: 8330383

Claim:
A lighting system for controlling colour light sources comprising: (a) a drive current controller for providing one or more primary drive current signals; (b) one or more first groups of light-emitting elements, each first group operatively connected to the drive current controller and each first group responsive to a primary drive current indicative of one of the one or more primary drive current signals; (c) a signal derivation module operatively connected to the drive current controller for determining one or more secondary drive current signals; and (d) one or more second groups of light-emitting elements, each second group operatively connected to the signal derivation module and each second group responsive to a secondary drive current indicative of one of the one or more secondary drive current signals; wherein each of the one or more secondary drive current signals is predetermined based on at least one of the one or more primary drive current signals, wherein one of the one or more second groups of light-emitting elements includes amber light-emitting elements, and wherein the secondary drive current signal indicative of a drive current for the amber light-emitting elements is derived based on a predetermined relationship of the primary drive current signals associated with the red light-emitting elements and green light-emitting elements.