Lutron Maestro Occupancy/Vacancy Sensor

Multiroom setups and "mood scenes" can cost into the thousands of dollars, but our favorite quick and easy smart-lighting upgrade is the Lutron Maestro Occupancy/Vacancy Sensor. It detects fine motions, turning on the lights when someone is in the room – and turning them off when no one's there. The sensor is so sophisticated, it keeps the lights on if you're in the room – even if you're not moving. It also works with energy-saving compact fluorescent and LED bulbs. [From $30; lutronstore.com]