Apparatus and method for adjusting lights according to the level of ambient light
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Dec 10, 1993
filing date -
Dec 10, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for controlling the level of light in an area or room. The device includes a sensor that detects whether the room is occupied, a light meter that detects the level of ambient light entering the room, and circuitry that controls the lights in the room in response to the sensor and light meter. The controlling circuitry increases the light level in the room when the room is occupied and the light meter senses that the ambient light level is not above a particular level. When the room is unoccupied for a brief period of time, the device increases or decreases the light level of the room by controlling lights accordingly, in response to the level of light sensed by the light meter. And finally, when the room is unoccupied for an extended period of time, the device turns power off to all the lights in the room.
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