Lighting
Occupancy sensor
An occupancy sensor switches lights on when it detects people in a space and turns them off after a set time with no motion.
ENERGY STAR says smart lights with built-in sensors turn lights on only when someone is present in a room and keep them off otherwise. Wall switch sensors do the same for a whole room. PNNL notes that outdoor use has been limited because older HID lamps were hard to switch on and off.
Sensors pair well with LED lighting that can turn on instantly. They are common in offices, storerooms and restrooms. A sensor can also work like a smart switch. See commercial electrician.
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