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LED lamp

United States Patent

November 12, 2013
View the Complete Patent at the US Patent & Trademark Office
There is herein described a lamp for providing white light comprising a plurality of light sources positioned on a substrate. Each of said light sources comprises a blue light emitting diode (LED) and a dome that substantially covers said LED. A first portion of said blue light from said LEDs is transmitted through said domes and a second portion of said blue light is converted into a red light by a first phosphor contained in said domes. A cover is disposed over all of said light sources that transmits at least a portion of said red and blue light emitted by said light sources. The cover contains a second phosphor that emits a yellow light in response to said blue light. The red, blue and yellow light combining to form the white light and the white light having a color rendering index (CRI) of at least about 80.
Galvez; Miguel (Danvers, MA), Grossman; Kenneth (Beverly, MA), Betts; David (Peabody, MA)
Osram Sylvania Inc. (Danvers, MA)
13/ 233,592
September 15, 2011
GOVERNMENT CONTRACT This invention was made with government support under Cooperative Agreement No. DE-EE0003241 awarded by the U.S. Department of Energy. The government has certain rights in the invention.