Patent ID: 8773024

Claim:
A method for tuning a color produced by a lamp having a plurality of light emitting diodes (LEDs) including at least three groups of LEDs wherein each group of LEDs produces light having a different color and wherein a current applied to each group of LEDs is independently variable, the method comprising: defining a target color; identifying, based on the target color, a first tuned color intermediate between a first color of light produced by a first one of the groups of LEDs and a second color of light produced by a second one of the groups of LEDs; identifying a second tuned color intermediate between the first tuned color and a third color of light produced by the third group of LEDs, the second tuned color being closer than the first tuned color to the target color; determining, based at least in part on one or more measurements of light produced by the lamp while current is supplied only to the first group of LEDs and the second group of LEDs, a first distribution of a total current between the first group of LEDs and the second group of LEDs that produces light having the first tuned color, the first distribution of the total current defining a target current ratio; determining, based at least in part on one or more measurements of light produced by the lamp while holding the target current ratio constant, a second distribution of the total current between the first and second groups of LEDs combined and the third group of LEDs that produces light having the second tuned color.