Patent ID: 7683301

Claim:
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.