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Method and apparatus for measuring spectral content of LED light source and control thereof

  • US 6,448,550 B1
  • Filed: 04/27/2000
  • Issued: 09/10/2002
  • Est. Priority Date: 04/27/2000
  • Status: Expired due to Term
First Claim
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1. A solid state illumination device for producing a predetermined spectral distribution comprising:

  • a plurality of light emitting diodes of different colors, a photosensor measuring incident light from the light emitting diodes, the light emitting diodes and photosensor connected to a control circuit comprising;

    a plurality of driver means, each driver means driving one or more light emitting diodes of a predetermined color, comparison means for comparing the output of the photosensor with the predetermined spectral distribution, and adjustment means coupled to the comparison means for adjusting the driver means such that the output of the photosensor matches the predetermined spectral distribution.

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  • 13 Assignments
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