Patent ID: 7384150

Claim:
A method of controlling a light emitting diode (LED) illumination system that includes a first colored LED, a second colored LED and a third colored LED, the method comprising: sequentially operating the first colored LED, the second colored LED, and the third colored LED in a color cycle frame with relative duty cycles having a known relationship that achieves a color balance; and operating the first colored LED, the second colored LED and the third colored LED during at least one spoke period in the color cycle frame, the operation of the first colored LED, the second colored LED and the third colored LED during the at least one spoke period being controlled to provide brightness adjusting light that matches the color balance achieved by the relative duty cycles of the first colored LED, the second colored LED, and the third colored LED during sequential operation thereof, wherein the operation of the first colored LED, the second colored LED and the third colored LED during the at least one spoke period is controlled by pulse width modulation of signals driving the LEDs.