Being the brightness

摘要

PROBLEM TO BE SOLVED: To allow a person to feel almost same brightness of irradiation light regardless of the hue of the irradiation light.;SOLUTION: The brightness of the irradiation light is corrected by multiplying a brightness correction coefficient. The brightness correction coefficient is decreased according as the chromaticity of the irradiation light on the CIE1931 chromaticity coordinates is away from the coordinate position of a white color w as a reference. The brightness correction coefficient is 0.90 to 1.00 when the color of the irradiation light is light yellow ty; the coefficient is 0.69 to 0.85 when the color is pink tr; the coefficient is from 0.66 to 0.80 when the color is yellow y; the coefficient is 0.61 to 0.75 when the color is yellow green yg; the coefficient is 0.58 to 0.70 when the color is light green tg; the coefficient is 0.54 to 0.66 when the color is blue green bg; the coefficient is 0.53 to 0.65 when the color is light blue tb; the coefficient is 0.45 to 0.55 when the color is green g; the coefficient is from 0.37 to 0.45 when the color is mandarin m; the coefficient is 0.26 to 0.32 when the color is purple p; the coefficient is 0.20 to 0.24 when the color is red r; and the coefficient is 0.17 to 0.21 when the color is blue b.;COPYRIGHT: (C)2009,JPO&INPIT