| 摘要 |
PROBLEM TO BE SOLVED: To provide an indoor lighting device capable of efficiently using a plurality of light sources and reducing the mounted number of light sources or maximum emission quantity of each of the light sources.SOLUTION: A ceiling light, even when receiving the warmest color setting or the coldest color setting, does not drive only one of either a warm color based LEDs or a cold color based LEDs, but drives both the warm color based LEDs and the cold color based LEDs, and sets illumination light to the warmest color or the coldest color by color mixture of the light emitted from both light sources. A value of chromaticity coordinates y of the warm color based LEDs or the cold color based LEDs, on condition that values of chromaticity coordinates x are the same in an xy chromaticity diagram, is set to be larger than a value of chromaticity coordinates y of a color track of black body radiation. The warm color based LEDs having the values of chromaticity coordinates xy respectively larger than those of a point corresponding to a color temperature of an (A) light source in the xy chromaticity diagram is used. The cold color based LEDs having the values of chromaticity coordinates xy respectively smaller than those of a point corresponding to a color temperature of a C light source in the xy chromaticity diagram is used. |
