| 摘要 |
Provided is a light irradiating device which has reduced number of part items and reduced manufacturing cost by having the sizes of LED substrates (2) identical. The light irradiating device is provided with a long LED substrate (2) whereupon a plurality of same LEDs (21) are mounted, and a case (3) having a substrate storing space for storing the LED substrate (2). The number of the LEDs (21) wherein a difference between a power supply voltage (VE) and the total of forward voltages (Vf) obtained when the LEDs (21) are connected in series is within a prescribed allowable range is set as an LED unit number. The number of LEDs (21) to be mounted on the LED substrate (2) is a common multiple of the LED unit number fixed for each of the LEDs (21) having different wavelengths. |
