Cheap Leviton ODS10-IDT Decora Wall Switch Occupancy Sensor (120/277V rating), Light Almond Review
I installed this automatic switch in a 40-person meeting room where the manual switch was very awkward to reach from either door. It has performed well for a year now, and prevents tripping up steps, and over folding chairs, and fumbling for the switch while carrying a load. The switch responds quickly to a wide angle of motion (nearly 180 deg.) and at least 30 feet away. I estimate that we've recouped the cost in energy savings by now. The only catch is that when the room is intended to remain dark (like for a candlelight dinner) the lens has to be covered; but just a little piece of paper taped over it works fine. I plan to buy more wherever there are several lights to control and a tendency to leave them on.
