Patent ID: 9544968
Date: 2017-01-10
CPC Classifications: F21K,F21S,F21V,F21Y,H05B

Claim:
1. An illumination apparatus comprising: a first LED configured to emit white light; a second LED configured to emit white light having a correlated color temperature lower than a correlated color temperature of the white light emitted from the first LED and a chromaticity deviation Duv higher than a chromaticity deviation Duv of the white light emitted from the first LED; and a controller configured to change a light output ratio of the first LED and the second LED, wherein the first LED emits the white light having a correlated color temperature ranging from 1563K to 4500K and a chromaticity deviation Duv ranging from −1.6 to −12, the second LED emits the white light having a correlated color temperature ranging from 1563K to 4500K and a chromaticity deviation Duv ranging from +10 to −1.6, and the controller controls such that in a xy chromaticity diagram, the white light emitted from the first LED is plotted in a region between a first curved line expressed by a following equation 1 and a second curved line expressed by a following equation 2, and the white light emitted from the second LED is plotted in a region between the first curved line and a third curved line indicating a chromaticity deviation Duv+10: