Patent ID: 6611000
Filing Date: 2003-08-26
Classification: F21K,F21V,F21Y,H01L

Abstract:
A lighting device comprising:a plurality of LEDs that are arranged in an at least two-dimensionally dispersed manner; a transparent resin layer that covers the plurality of LEDs in an integrated form; a photo-detecting unit using a photodetector that detects an intensity of light emitted from the plurality of LEDs, the photodetector being arranged inside, on a surface, or in the vicinity of the transparent resin layer; and a power supply circuit unit that controls driving of the plurality of LEDs based on a detection output from the photo-detecting unit, wherein the number of the photodetector is smaller than the number of the LEDs, and the photodetector detects an intensity of light emitted from the LEDs and propagated through the transparent resin layer.