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US 9,807,824 B2Granted
Methods and apparatus for sensing light output and controlling light output
AssigneePhilips Lighting Holding B.V.
InventorsDirk Valentinus René Engelen, Dzmitry Viktorovich Aliakseyeu, Bartel Marinus Van De Sluis, Tatiana Aleksandrovna Lashina, Tim Dekker
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Abstract
Methods and apparatus for lighting control. In some embodiments methods and apparatus are provided that sense a low lighting condition at a location and direct light toward that location after detection of the low lighting condition. In some embodiments apparatus are provided that include a plurality of networked LEDs. Some of the LEDs may be illuminated in response to sensed light conditions at certain locations.
Claims20
A method, comprising:
- activating each of a plurality of light-generating LEDs in a calibration mode;
- measuring a light intensity at each of a plurality of light-sensing nodes during said calibration mode to determine a light intensity contribution of each of said light-generating LEDs at each of said light-sensing nodes;
- monitoring said light intensity at each of said plurality of light-sensing nodes during an active mode;
- detecting a blocked condition at a blocked node of said light-sensing nodes when said light intensity at said blocked node is below a threshold level in said active mode;
- and
- activating at least one of the light-generating LED in response to detecting said blocked condition, wherein said activated at least one light-generating LED provides at least a minimum light intensity contribution of said light intensity contribution at said blocked node during said calibration mode.
3 more elements
A method, comprising:
- associating directional information and intensity information of a plurality of light-generating LEDs with a plurality of light-sensing nodes;
- associating a directional parameter with each of said light-sensing nodes;
- monitoring a light intensity at each of said light-sensing nodes;
- detecting a blocked condition at a blocked node of said light-sensing nodes when said light intensity is below a threshold level at said blocked node;
- and
- activating, in response to said blocked condition, at least one of said light-generating LEDs associated with said blocked node that has said directional information corresponding to said directional parameter of said blocked node.
3 more elements
A network of LEDs, comprising:
- a plurality of networked LEDs;
- said networked LEDs including a first LED configured to selectively generate a light output therefrom and a second LED configured to selectively sense a light intensity level thereat;
- wherein said light output of said first LED affects said light intensity at said second LED when no obstructions are present therebetween;
- wherein said first LED is illuminating in the direction of said second LED in response to said second LED sensing said light intensity level thereat below a threshold value.
1 more element
Dependencies are inferred from the claim text.