A system for selectively providing power from a power source to a load to operate in an area for at least one occupant comprising a processing device for controlling the opening and closing of a relay connected between the load and the power source for energizing the load, and a sensor for detecting...http://www.google.ca/patents/US5946209?utm_source=gb-gplus-sharePatent US5946209 - Motion sensing system with adaptive timing for controlling lighting fixtures
