Outdoor photocell switches can turn lights on at dusk and off at dawn. They can also be used indoors to turn lights on or increase their brightness when daylight isna#39;t sufficient. When they are used indoors, be sure to connect the photocellanbsp;...
|Title||:||Tips for saving energy in small businesses|
|Author||:||Solar Energy Research Institute, United States. Dept. of Energy. Office of Conservation and Renewable Energy. Residential and Conservation Division|