| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lighting device whose color temperature can be changed, while keeping light flux approximately constant, using a simple control. <P>SOLUTION: When the color temperature is at 3,000°K, an electric bulb color light lamp L is lighted at a dimming ratio of 100%, and a daylight color lamp D and a blue light lamp B are turned off. When the color temperature is raised from 3,000°K, the electric bulb color light lamp L increases its dimming ratio, to decrease its light quantity and contrarily the daylight color lamp D decreases its dimming ratio to increase its light quantity according to the color temperature. At the color temperature of A point or higher where the dimming ratio of the lamp D becomes 100%, the lamp B having blue light is lighted and its dimming ratio is decreased gradually according to the color temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
