Variable color light emitting device and illumination apparatus using the same

摘要

A variable color light emitting device includes first, second and third light sources differing in chromaticity of emission light; and a driver for changing light outputs. 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.