| 摘要 |
PROBLEM TO BE SOLVED: To enable an illumination intensity to be easily grasped in sensuous terms, even when there is no special knowledge thereof, by utilizing the variations in colors due to lamps having two different colors. SOLUTION: A controller 6 is provided which controls the brightness values of the lamps 3, 4 with the two different colors, based on the illumination intensity measured by an illumination intensity sensor 5. The range to be contrasted with the measured illumination intensity is set previously; and if the measured illumination intensity is the upper limit or more in the set range of the illumination intensity, or the lower limit or less in the set range of the illumination intensity, one lamp is controlled so as to be set to a maximum or minimum in brightness, and the other lamp is controlled so as to be set to a minimum or maximum in brightness. If the measured illumination intensity is lower/higher than the upper/lower limits in the set range of the illumination intensity, the brightness of the one lamp is set high, and the brightness of the other lamp is set low, when the measured illumination intensity is on the upper limit side, and the brightness of the one lamp is set low, and the brightness of the other lamp is set high, when the measured illumination intensity is on the lower limit side. COPYRIGHT: (C)2010,JPO&INPIT
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