公开(公告)号：US20210136891A1

公开(公告)日：2021-05-06

申请号：US17086278

申请日：2020-10-30

Applicant: NICHIA CORPORATION

Inventor： Junichi EGUCHI ,  Kenji ASAI

IPC: H05B45/28 ,  H01L33/50

Abstract: A lighting device including a first light emitting device that emits light of first chromaticity coordinates and has a high melanopic ratio, a second light emitting device that emits light of second chromaticity coordinates, and a third light emitting device that emits light of third chromaticity coordinates and has a low melanopic ratio, wherein light in a range from a first temperature to a second temperature on the black body radiation locus is included in a triangular area surrounded by a straight line connecting the first chromaticity coordinates and the second chromaticity coordinates, a straight line connecting the second chromaticity coordinates and the third chromaticity coordinates, and a straight line connecting the third chromaticity coordinates and the first chromaticity coordinates, in the chromaticity diagram of the CIE1931 color system.