Patent ID: 8853966

Claim:
A lighting device comprising: a plurality of lighting control units configured to control lighting of a plurality of solid state lighting element groups irradiating lights of different chromaticities; and a color ratio setting unit for setting a target output ratio of the solid state light emitting element groups, wherein the lighting control units are provided for the solid state light emitting element groups respectively, wherein, in an xy chromaticity diagram of an XYZ color system, a straight line connecting chromaticity coordinates of lights irradiated by a first and a second solid state light emitting element group among the solid state light emitting element groups intersects a black body locus, wherein the lighting control units include a first lighting control unit for controlling lighting of the first solid state light emitting element group and a second lighting control unit for controlling lighting of the second solid state light emitting element group, wherein the target output ratio includes a target output ratio of the second to the first solid state light emitting element group, and wherein the first and the second lighting control unit respectively perform feedback control whereby feedback control of the second lighting control unit is based at least in part on a detection result of feedback control of the first lighting control unit to cause an output ratio of the second to the first solid state light emitting element group to become equal to the target output ratio of the second to the first solid state light emitting element group.