| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light-emitting diode lighting apparatus in which failure of a power supply circuit can be prevented by reducing a load to a power supply circuit by eliminating necessity of switching on and off of power supply to an LED of each color for detecting optical output of LEDs of each color and lighting these in the order. <P>SOLUTION: The LED lighting apparatus includes a plurality of colors of LEDs, a power supply circuit for lighting the LEDs, and a photosensor. The photosensor is constructed so that its photosensitivity distributions F1-F3 may correspond to spectral distributions S1-S3 of LED of each color, and may not mutually overlap. Thereby, the photosensor can detect simultaneously optical output of each color of LED and that it is not necessary to switch on and off power supply to each color of LEDs for detecting optical output of each color of LED and light these in order like the conventional one, and the optical output detection of each color can be made with all colors of LEDs lighted. Thereby, a load required for the power supply circuit can be reduced and failure of power supply circuit can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT |
