[Xringer]

I don't think sensors would help very much for lighting, unless the lights were also controlled by a smart computer program.

Just using Off-the-shelf units will turn on the lights for a set minimum time cycle,
each time someone was in the room, even if it was only for a few seconds.

The other big problem I have with my automatic lights, if I'm not constantly moving around,
they go off, normally at the worst possible moment.