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Method for preventing incorrect lighting adjustment in a daylight harvesting system

  • US 7,683,301 B2
  • Filed: 02/08/2007
  • Issued: 03/23/2010
  • Est. Priority Date: 02/08/2006
  • Status: Active Grant
First Claim
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1. A method for preventing incorrect lighting adjustments in a daylight-harvesting system installed in a building, where the daylight harvesting system controls the output of a lighting system based on daylight and/or other light sources to reduce energy usage while providing a target light level for an area of the building, comprising:

  • measuring a first light level using a first sensor that measures the current light level for the area;

    measuring a second light level for a second area different from the area of the building using a second sensor;

    detecting through the first sensor a change in the first light level;

    determining from the second sensor whether the second light level has also changed; and

    maintaining the target light level for the area;

    wherein maintaining the target light level for the area involves adjusting the light output of the lighting system when the first sensor and the second sensor detect a correlated change in measured light levels; and

    wherein adjusting the light output of the lighting system involves reducing the energy used by the lighting system when daylight and/or other light sources illuminate the area.

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