Patent ID: 8777447
Filing Date: 2014-07-15
Classification: F21K,F21V,F21Y

Abstract:
1. A variable color light emitting device, comprising: first, second and third light sources differing in chromaticity of emission light; and a driver for changing light outputs of the first, second and third light sources, wherein the first light source has a chromaticity closer to a blackbody locus in a chromaticity coordinates than chromaticities of the second and third light sources, the chromaticities of the second and third light sources interposing the blackbody locus therebetween, and wherein the chromaticities of the second and third light sources are selected such that, on straight lines passing through reference chromaticities of the second and third light sources and a chromaticity of an arbitrary color temperature on the blackbody locus, a ratio of a distance between the chromaticity of the second light source and the chromaticity on the blackbody locus to a distance between the chromaticity of the third light source and the chromaticity on the blackbody locus becomes equal to a ratio of a distance between the reference chromaticity of the second light source and the chromaticity on the blackbody locus to a distance between the reference chromaticity of third light source and the chromaticity on the blackbody locus.