When one of these wireless LEDs detects motion, all the lights on the network switch on. The last Mr Beams NetBright Spotlight to detect motion will then turn off after 30 seconds of inactivity and send a signal that turns off the other lights as well. Each spotlight provides 200 lumens of light and can run a year or more on three D-cell batteries, which can power up to 5,000 activations, according to the manufacturer. Each light has four channels for creating separate networks of up to 50 spotlights each, with a range of 200 feet. The company also makes path and deck lighting. Spotlights sell for about $80 a pair. Wireless Environment, wirelessenv.com