| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device including a simple combination of a light-emitting diode (LED) having a low color temperature and an LED having a high color temperature which can obtain five white colors of a lamp color, a warm white color, a white color, a daylight white color, and a daylight color by changing the brightness of at least one of the diodes. <P>SOLUTION: The lighting device is mounted with a plurality of LEDs each of which has an LED element and a phosphor which is excited by its emission and emits the light of a different wavelength, or LEDs each having only the LED element as a light-emitting source on a circuit substrate. The high color temperature LED 11 and the LED 10 having a lower color temperature than that of the high color temperature LED are combined as a pair and mounted to the circuit substrate 13. A power supply circuit that changes an optical output of at least one of the LEDs is provided, and is made possible to emit light of a plurality of white colors selected from a group of the daylight color, the daylight white color, the white color, the warm white color, and the lamp color by changing the optical output. <P>COPYRIGHT: (C)2011,JPO&INPIT |
