Patent ID: 8143777
Filing Date: 2012-03-27
Classification: F21K,H01L

Abstract:
1. An LED lighting unit comprising: a first light source including a blue LED configured to emit blue light and a phosphor material configured to wavelength-convert at least a part of the blue light emitted from the blue LED to red wavelength light and green wavelength light, the phosphor material configured to emit more red wavelength light than green wavelength light, and the first light source configured to emit light having a color temperature located substantially on a blackbody locus; a second light source including a blue LED configured to emit blue light and a second phosphor material configured to wavelength-convert at least a part of the blue light emitted from the blue LED to red wavelength light and green wavelength light, the second phosphor material configured to emit more green wavelength light than red wavelength light, and the second light source configured to emit light having a higher color temperature substantially on the blackbody locus than a color temperature of light emitted from the first light source; a third light source including a blue LED configured to emit blue light and a third phosphor material configured to wavelength-convert at least a part of the blue light emitted from the blue LED to at least one of a green wavelength light and a yellow wavelength light, and the third light source configured to emit light located within at least one of a green color area and a yellow color area in an xy chromaticity diagram; and a lens located in a direction of light-emission of light emitted from the first light source, the second light source and the third light source, and the lens being configured to control a mixture of the light emitted from the first light source, the second light source and the third light source, wherein the light emitted from each of the first light source, the second light source and the third light source maintains an emission intensity of more than 20 percent of a maximum emission intensity of a respective one of the first light source, the second light source and the third light source when emitting light within a wavelength range of at least from 470 nm to 600 nm.