Techniques for lumen maintenance and color shift compensation
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United States of America Patent
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Aug 22, 2017
Grant Date -
Aug 4, 2016
app pub date -
Apr 8, 2016
filing date -
Jul 1, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are disclosed for maintaining consistent lumen output of a lighting assembly over time. By maintaining a consistent lumen output, it is possible to maintain acceptable color stability where color mixing of multiple outputs is used. The lighting assembly may be any lighting configuration that might suffer from lumen depreciation and/or color drift over time, and may include any type(s) of light source(s) that may be monitored and driven accordingly. The lighting assembly, in addition to light source(s), includes a photo detector and a directed light source, such as a laser. The directed light source provides a golden sample for use in calibrating the photo detector, which in turn monitors lumen output of the light source(s). Drive signals are adjusted to account for lumen depreciation of the monitored light source(s).
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