Lighting Photosensor Controls
You can use photosensors to prevent outdoor lights from operating during daylight hours. This can help save energy because you don't have to remember to turn off your outdoor lights.
Photosensors sense ambient light conditions, making them useful for all types of outdoor lighting. They offer little utility in controlling lights inside the home because lighting needs vary with occupant activity rather than ambient lighting levels.
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Product Information
National Lighting Product Information Program
Lighting Research Center - Rensselaer Polytechnic Institute
Related Links
Photosensors
Lighting Research Center