Light emitting diode based lighting system with time division ambient light feedback response
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United States of America Patent
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Jan 29, 2013
Grant Date -
Jul 8, 2010
app pub date -
Jun 30, 2009
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
A lighting system includes time division light output sensing and adjustment for ambient light. In at least one embodiment, time division light output sensing involves modulating power to a light emitting diode (LED) set, and the set of LEDs includes one or more LEDs. In at least one embodiment, each LED in the LED set is included in a single lamp, and, in at least one embodiment, the set of LEDs is contained in multiple lamps. In at least one embodiment, for each lamp, a controller modulates power to the LED set by selectively reducing power to the LED set using time division algorithm to allow a light sensor to sense the brightness of ambient light with a reduced contribution from the LED set. In at least one embodiment, a lighting system also includes time division light output sensing and adjustment for different spectra LEDs.
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