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US 2024/0279541 A1Published application
Light-emitting device, lamp, and lighting fixture
AssigneeNichia Corporation
InventorsMika MATSUMOTO, Miyuki KURATA, Kazushige FUJIO
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AssigneeNichia Corporation
InventorsMika MATSUMOTO, Miyuki KURATA, Kazushige FUJIO
Estimating the term…
Provided are a light-emitting device, a lighting appliance, and a lighting fixture that emit light that tends to promote melatonin secretion. The light-emitting device, the lighting appliance, and the lighting fixture include a light-emitting element having an emission peak wavelength in a range of 400 nm to 490 nm and a first phosphor having an emission peak wavelength in a range of 570 nm to 680 nm. The emitted light has a correlated color temperature that is 1950 K or less, an average color rendering index Ra that is 40 or greater, a full width at half maximum of an emission spectrum indicating a maximum emission intensity in an emission spectrum of the light-emitting device that is 110 nm or less, and a melanopic ratio MR derived from Equation (1) that is 0.233 or less.
1-14. (canceled)
A light-emitting device comprising:
A light-emitting device comprising:
Dependencies are inferred from the claim text.