White lamps with enhanced color contrast

Details White lamps with enhanced color contrast White lamps with enhanced color contrast

2005-11-22

2008-11-18

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S486000

Reexamination Certificate

active

07453195

ABSTRACT:
A lighting apparatus for emitting white light including a semiconductor light source emitting radiation with a peak at from about 250 nm to about 500 nm; a first phosphor having a peak emission between about 450 and 550 nm; and a second phosphor having a peak emission between about 615 and 670 nm; wherein the overall emission spectrum of the lighting apparatus has a depression between about 550 and 615 nm, said depression extending to between about 5% and 25% of the highest intensity of the emission spectrum of the lighting apparatus in the region from 400 to 700 nm. In this apparatus, the red-green color contrast is increased versus the referent illuminant.

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Y. Ohno, “Color Rendering and Luminous Efficacy of White LED Spectra”, Proc. SPIE Solid State Lighting Conference, Aug. 3-5, 2004, Denver.

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