Patent ID: 7969097
Filing Date: 2011-06-28
Classification: H05B,Y02B

Abstract:
1. A lighting device comprising: a first group of solid state light emitters, said first group of solid state light emitters comprising at least one solid state light emitter, said first group of solid state light emitters (1) having an illumination which corresponds to a point on a 1976 CIE diagram which is spaced from a first group point by a distance such that delta u′, v′ relative to the first group point is not more than 0.015 on said 1976 CIE diagram, and/or (2) having a forward voltage temperature dependence which is within 5% of a first group forward voltage temperature dependence; at least one first group reference solid state light emitter, said first group reference solid state light emitter (1) having an illumination which corresponds to a point on said 1976 CIE diagram which is spaced from said first group point by a distance such that delta u′, v′ relative to said first group point is not more than 0.015 on said 1976 CIE diagram, and/or (2) having a forward voltage temperature dependence which is within 5% of said first group forward voltage temperature dependence; and a first reference sensor which detects an intensity of said first group reference solid state light emitter.