As if by magic, when you approach your house, lights go on. Then, once you've walked inside, living room sconces gradually brighten to a warm glow, and lights continue to turn on as you walk through the house.
Infrared or ultrasonic sensors turn lights off or on automatically, depending upon whether or not they sense the presence of someone in the room. These are made by several companies--Leviton, LightAlert!, and LVS, to name a few. Infrared types pick up minute changes in the infrared background of a room that occurs when a human is present. Ultrasonic types are activated by inaudible sound waves that sense motion.
Wall-mount occupancy sensors replace a standard single-pole switch--they don't require special wiring. Ceiling-mount models, which can cover a larger room, are generally installed when a house is built because most have wires that run from the sensor to a switch.
Other related products are available, too. LVS makes a fluorescent light fixture with a built-in occupancy sensor that's ideal for closets. Lamson Home Products makes a motion-sensing light adapter that can be screwed into a conventional light socket--ideal for security lighting.
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