Methods for combining light emitting devices in a white light emitting apparatus that mimics incandescent dimming characteristics and solid state lighting apparatus for general illumination that mimic incandescent dimming characteristics

摘要

A light emitting apparatus includes a first light emitting device configured to emit light having a first chromaticity point that falls within a region on a 1931 CIE Chromaticity Diagram defined by points having coordinates (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38), and at least two second light emitting devices, each of the at least two second light emitting devices emits light having a respective second chromaticity points that that have ccx values greater than 0.4077 and ccy values less than 0.3944 on the 1931 CIE Chromaticity Diagram. A combined light emitted by the first light emitting device and the at least two second light emitting devices has a third chromaticity point that falls within a 7-step MacAdam ellipse around a point on the black body locus having a correlated color temperature between 2700K and 6500K. The third chromaticity may shift to a more reddish chromaticity when power supplied to the light emitting devices is decreased.

主权项

1. A light emitting apparatus, comprising:
a first light emitting device configured to emit light having a first chromaticity point that falls within a region on a 1931 CIE Chromaticity Diagram that is within a 7-step MacAdam ellipse around any point in a space defined by points having coordinates (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38); and at least two second light emitting devices, wherein each of the at least two second light emitting devices emits light having a respective second chromaticity points that have ccx values greater than 0.4077 and ccy values less than 0.3944 on the 1931 CIE Chromaticity Diagram; wherein a combined light emitted by the first light emitting device and the at least two second light emitting devices has a third chromaticity point that falls within a 7-step MacAdam ellipse around a point on the black body locus having a correlated color temperature between 2700K and 6500K; and wherein the respective second chromaticity points fall within a second region on the 1931 CIE Chromaticity Diagram defined by points having coordinates (0.4077, 0.3652), (0.4147, 0.3814), (0.4593, 0.3944), and (0.4492, 0.3772).