Invention Grant
- Patent Title: Light emitting device, light fixture, and street light
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Application No.: US17660723Application Date: 2022-04-26
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Publication No.: US11655963B2Publication Date: 2023-05-23
- Inventor: Mika Matsumoto , Kazushige Fujio
- Applicant: NICHIA CORPORATION
- Applicant Address: JP Anan
- Assignee: NICHIA CORPORATION
- Current Assignee: NICHIA CORPORATION
- Current Assignee Address: JP Anan
- Agency: Hunton Andrews Kurth LLP
- Priority: JP 2021074393 2021.04.26
- Main IPC: F21V9/30
- IPC: F21V9/30 ; F21S8/08 ; C09K11/77 ; C09K11/61 ; F21W131/103

Abstract:
A light emitting device comprises a light emitting element having a light emission peak wavelength in a range of 400 nm or more and 490 nm or less and a first fluorescent material having a light emission peak wavelength in a range of 570 nm or more and 680 nm or less, and emits light having a correlated color temperature being 1,950 K or less, an average color rendering index Ra being 51 or more, a full width at half maximum of a light emission peak having a maximum light emission intensity in a light emission spectrum of the light emitting device being 110 nm or less, and a first glare index Ls1/L that is a ratio of a first effective radiance Ls1 to a luminance L being 0.493 or less, wherein Ls1 and L are as defined in the disclosure.
Public/Granted literature
- US20220349553A1 LIGHT EMITTING DEVICE, LIGHT FIXTURE, AND STREET LIGHT Public/Granted day:2022-11-03
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