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Systems and methods for controlling light sources

  • US 8,937,443 B2
  • Filed: 04/08/2014
  • Issued: 01/20/2015
  • Est. Priority Date: 02/10/2006
  • Status: Expired due to Fees
First Claim
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1. A method for controlling light output of an array comprising a plurality of series-connected of light sources by a controller while maintaining a desired operating emittance of the array, each light of the array having a shunt switch, the method comprising:

  • energizing the array of series-connected plurality of light sources by applying a current necessary to generate for the desired operating emittance;

    during a first time period, closing the shunt switch of a light source of the plurality of light sources, wherein the light source is extinguished;

    sampling the remaining light of the array by an optical sensor during the first time period and during a second time period when the shunt switch is de-energized;

    determining a difference in emittance between the first and second time periods;

    comparing the difference in emittance to a luminance value stored in a memory associated with the shunted light source; and

    subsequently controlling the operation of the shunt switch based on the comparison, wherein the subsequent controlling produces the desired operating emittance of the array.

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