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Color temperature tunable white light source

DC
  • US 8,203,260 B2
  • Filed: 04/13/2007
  • Issued: 06/19/2012
  • Est. Priority Date: 04/13/2007
  • Status: Active Grant
First Claim
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1. A color temperature tunable white light source, the source comprising:

  • an array of first LED arrangements operable to emit white light with a color correlated temperature (CCT) in a range of 2500 K to 4000 K and second LED arrangements operable to emit white light with a color correlated temperature (CCT) in a range of 6000 K to 10,000 K;

    wherein the LED arrangements are configured such that a composite light is emitted by the array;

    wherein the relative drive currents of the first and second LED arrangements are controllable, and thus variable in relative magnitude, such that the color correlated temperature of the composite light emitted by the array is electrically tunable.

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