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Light emitting diode (LED) based lighting systems

  • US 8,376,580 B2
  • Filed: 04/12/2011
  • Issued: 02/19/2013
  • Est. Priority Date: 03/05/2007
  • Status: Active Grant
First Claim
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1. A lighting system comprising:

  • at least one blue emitting LED configured to emit blue excitation light having a wavelength ranging from 420 nm to 470 nm;

    a shade located remotely to the at least one LED and configured to at least in part surround the LED to thereby prevent at least in part direct viewing of the at least one LED, wherein the shade is configured such that at least some of the blue excitation light travels in free-space a distance of at least one centimeter from the at least one LED to the shade; and

    a first phosphor provided as a layer on at least a part of an inner and/or outer surface of the shade;

    wherein the phosphor emits light of a different wavelength in response to incident excitation light, and wherein the combined light from the LED and the phosphor generate a desired color of light; and

    wherein the shade is selected from the group consisting of;

    translucent, transparent and opaque.

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