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LIGHT UNIT WITH INTERNAL POWER FAILURE DETECTION

  • US 20100135000A1
  • Filed: 04/07/2008
  • Published: 06/03/2010
  • Est. Priority Date: 04/06/2007
  • Status: Active Grant
First Claim
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1. A lighting apparatus, comprising:

  • a power input configured to receive external power from an external power sourcea solid state light element that is interconnected to the power input;

    a detection circuit interconnected to the power input and that, when power is not provided to the power input, measures input impedance at the power input and determines if there is a lack of external power; and

    a back-up power source that is interconnected to the solid state light element, the detection circuit, and the power input, that provides power to the solid state light element when the light element is not provided with power from the power input.

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