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Techniques for lumen maintenance and color shift compensation

  • US 9,335,210 B2
  • Filed: 07/01/2014
  • Issued: 05/10/2016
  • Est. Priority Date: 07/01/2014
  • Status: Active Grant
First Claim
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1. A lighting assembly, comprising:

  • a diffusible light source to illuminate an area by providing light output, wherein the provided light output is measured in lumens;

    a photo detector configured to measure lumen output of the diffusible light source and a golden sample light beam;

    a directed light source to provide the golden sample light beam, wherein the golden sample light beam is used to calibrate the photo detector; and

    a controller configured to determine a photo detector calibration factor based on a first lumen output measurement of the directed light source and a second lumen output measurement of the directed light source, the calibration factor indicative of photo detector degradation over a period of time between the first lumen output measurement and the second lumen output measurement.

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