Time division light output sensing and brightness adjustment for different spectra of light emitting diodes
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United States of America Patent
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Oct 30, 2012
Grant Date -
Jun 17, 2010
app pub date -
Jun 30, 2009
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
In at least one embodiment, brightness multiple LEDs is adjusted by modifying power to subgroups of the multiple LEDs during different times and detecting the brightness of the LEDs during the reductions of power. In at least one embodiment, once the brightness of the LEDs are determined, a controller determines if the brightness meet target brightness values, and, if not, the controller adjusts each LED with the goal meet the target brightness values. In at least one embodiment, a process of modifying power to the subgroups of multiple LEDs over time and adjusting the brightness of the LEDs is referred as “time division and light output sensing and adjusting. Thus, in at least one embodiment, a lighting system includes time division light output sensing and adjustment for different spectrum light emitting diodes (LEDs).
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