Patent ID: 8710768
Filing Date: 2014-04-29
Classification: H05B

Abstract:
1. A method for controlling a multi-color lighting system for combining light from multiple color sources to produce light of a desired color characteristic, wherein the lighting system comprises three light sources each for producing light of a different one of three colors, each light source comprising one or more light emitters, the method comprising the steps of: receiving an input relating to color coordinates of a target point defined in a first color space; defining, in the first color space, a first volume having boundaries with endpoints corresponding to color characteristics of the light sources when operated at or near respective maximum intensities; from the first volume, determining first-pass light amounts of respective maximum intensity light contributions from the light sources to achieve light at the target point; determining first-pass driver settings for the light sources based on the determined first-pass light amounts; when the light is to be dimmed to a proportion of the maximum target intensity, adjusting the first-pass driver settings in accordance with the determined first-pass light amounts and the proportion of the maximum target intensity; defining, in the first color space, a second volume having boundaries with endpoints corresponding to reduced intensity color characteristics of the light sources when operated at the adjusted first-pass driver settings; from the second volume, determining second-pass light amounts of respective reduced intensity light contributions from the light sources to achieve light at the target point; determining second-pass driver settings for the light sources based on the determined second-pass light amounts; and applying the second-pass driver settings to drive the light sources to produce a color corrected output light having a color characteristic corresponding to the target point dimmed to the proportion of the maximum target intensity.