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Lighting fixture using semiconductor coupled with a reflector having reflective surface with a phosphor material

  • US 8,356,912 B2
  • Filed: 06/16/2009
  • Issued: 01/22/2013
  • Est. Priority Date: 09/29/2004
  • Status: Active Grant
First Claim
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1. A lighting fixture for emitting visible light and adapted to provide lighting in an area to be inhabited by a person, the lighting fixture comprising:

  • a structure forming an optical integrating cavity, the optical integrating cavity comprising;

    a diffusely reflective inner surface of the cavity; and

    at least one optical passage through a diffusely reflective wall of the cavity for emission of radiant energy integrated by diffuse reflection within the cavity;

    a plurality of light emitting diodes (LED), each LED comprising an enclosure and a semiconductor chip contained within the enclosure, each LED coupled for emission of radiant energy into the cavity, at least one of the LEDs emitting radiant energy of a first wavelength; and

    a coating layer containing at least one phosphor, extending across a substantial portion of the diffusely reflective inner surface of the cavity, the at least one phosphor being of a type excited by radiant energy of the first wavelength for emission of visible light of at least one second wavelength different from the first wavelength for reflection,wherein the diffusely reflective inner surface of the cavity is outside the enclosures of the LEDs.

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