Patent ID: 8598793
Filing Date: 2013-12-03
Classification: H05B

Abstract:
1. A method for tuning a color produced by a lamp having a plurality of light emitting diodes (LEDs) including a plurality of 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: establishing at least two different testing distributions of a total current among the groups of LEDs; for each of the different testing distributions of the total current, measuring a color of light produced by the lamp; defining a target color; and determining a desired distribution of the total current based at least in part on the measured colors and a proportionality constant that linearly relates a unit of change in the distribution of the total current to an amount of change in the color of light produced by the lamp, wherein the desired distribution of the total current produces light having the target color.