A light-emitting diode white light source

摘要

A system of at least three multi-coloured LED's has an optimized colour rendering index by proper selection of wavelengths of each LED, such system being useful for general illumination purposes. In a preferred embodiment, a blue LED has a wavelength in the range 455 to 490 nm, a green LED has a wavelength in the range 530 to 570 nm, and a red LED has a wavelength in the range 605 to 630 nm.