Cree Gmbh

Charles Draper

Paul Kenneth Pickard

Gerald H Negley

Kurt S Wilcox

Michael John Bergmann

James Ibbetson

Mark D Edmond

Jason Edward Taylor

David Clatterbuck

Nalini Gupta

A high-efficiency LED lamp is disclosed. Embodiments of the invention provide a high-efficiency, high output solid-state lamp. The lamp includes an LED assembly, an optical element disposed to receive light from the LED assembly, and an optical overlay. The optical element includes a primary exit surface, wherein the primary exit surface is at least about 1.5 inches from the LED assembly. In example embodiments, the optical element is roughly cylindrical in shape, but can take other shapes and be made from various materials. An LED lamp according to some embodiments of the invention has an efficiency of at least about 160 lumens per watt. In some embodiments, the lamp has a light output of at least 1200 lumens. In some embodiments, the LED lamp produces light with a color rendering index (CRI) of at least 90 and a warm white color.

High efficiency LED lamp

Solid state light emitting apparatuses include blue LEDs (e.g., including short wavelength and long wavelength blue LEDs in combination) to stimulate green lumiphors, with supplemental emissions by red lumiphors and/or red solid state light emitters, to provide aggregate emissions with high S/P ratio (e.g., &#x2267;1.95) and high color rendering values (e.g., &#x2267;85), preferably in combination with high brightness and high luminous efficacy. In certain embodiments, a light emitting apparatus may be devoid of a LED having a peak wavelength of from 470-599 nm and/or devoid of lumiphors with peak wavelengths in the yellow range. Multiple LEDs may be arranged in an emitter package. A fabrication method includes mounting multiple solid state emitters (e.g., with a first blue and a second red emitter) to a common substrate, applying a stencil or mask over the second emitter, applying a lumiphoric material over the first emitter, and removing the stencil or mask.

Solid state lighting apparatus with high scotopic/photopic (S/P) ratio

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Apex, NC, United States of America

Charles Draper