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Apparatus and method for discretionary adjustment of lumen output of light sources having lamp lumen depreciation characteristic compensation

  • US 8,525,439 B1
  • Filed: 12/28/2011
  • Issued: 09/03/2013
  • Est. Priority Date: 02/24/2004
  • Status: Expired due to Fees
First Claim
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1. A method for illumination with a light fixture comprising a lamp having a lumen depreciation characteristic and an initial light output at a rated operating wattage, a reflector in which the lamp is positioned, a mount for mounting the lamp and reflector to a support structure, and a ballast for providing a plurality of operating wattages to the lamp to produce its light output, comprising:

  • a. timing cumulative operation time of the lamp; and

    b. adjusting a controllable factor related to the lamp wherein adjustment to the controllable factor is based on information regarding a relationship between the controllable factor and lumen output, the adjustment comprising switching in an operating wattage from the plurality of operating wattages to the lamp in response to the cumulative operating time of the lamp.

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