Patent ID: 6817735
Filing Date: 2004-11-16
Classification: F21K,F21Y,H01L,Y10S

Abstract:
An illumination light source comprising four types of light-emitting diodes,wherein the four types of light-emitting diodes are a blue light-emitting diode emitting blue light having an emission wavelength peak at 420 to 470 nm, a blue-green light-emitting diode emitting blue-green light having an emission wavelength peak at 500 to 550 nm, an orange light-emitting diode emitting orange light having an emission wavelength peak at 570 to 600 nm and a red light-emitting diode emitting red light having an emission wavelength peak at 610 to 660 nm; and the light source having a general color rendering index of at least 90.