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Spectral Shift Control for Dimmable AC LED Lighting

  • US 20110210678A1
  • Filed: 06/27/2010
  • Published: 09/01/2011
  • Est. Priority Date: 08/14/2009
  • Status: Active Grant
First Claim
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1. An apparatus for a solid state light engine, the apparatus comprising:

  • a pair of terminals to receive an applied electrical excitation for a load;

    a first network in the load, wherein the first network includes a first plurality of light emitting diodes (LEDs) arranged in series connection to form a first current path, the first plurality of LEDs having a first color characteristic;

    a second network in the load, wherein the second network includes a second plurality of LEDs arranged in series connection to form a second current path, the second plurality of LEDs having a second color characteristic that is substantially different from the first color characteristic; and

    ,means for selectively diverting current away from at least one of the first and second networks of LEDs,wherein a color characteristic of the combined light output of the first and second networks varies between the first color characteristic and the second color characteristic as a function of the applied electrical excitation, and wherein a rate of change of intensity for a first peak wavelength is at least 40% higher than a rate of change of intensity for a second peak wavelength as the applied electrical excitation is varied within a limited range that encompasses 80% of rated voltage.

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