Lighting device with reduced light output degradation
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United States of America Patent
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Apr 11, 2017
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app pub date -
Jul 6, 2015
filing date -
May 19, 2011
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Abstract
A lamp includes a substrate having a center region and a peripheral region, a first subset of light-emitting devices disposed on the center region, and a second subset of light-emitting devices disposed on the peripheral region. A temperature difference between the center region and the peripheral region is greater than 10 degrees.
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