You need a magnetic low voltage occupancy sensor and dimmer. Try looking up MLV occupancy sensor @ cooper industries.com ...

They can set these things to different levels of sensitivity and how far out they pick up heat/motion. We are building a house with the motion sensors all over the place. We are having to select how far out in diameter they will pick up motion (so a person walking down the hall doesn't turn on a light in an empty room) and how sensitive - so the cat doesn't turn the dang things on and off. Have maintenance adjust the thing.

I was really disappointed last week after extensive searching online and not finding attractive, quality selections like I expected. I gave up and went to HD and was pleased to find a style that I found fairly attractive, the Shaker Cove $44.97, but it is not the high level of quality I had initially wanted. My electrician installed it, I did not examine it, he temporarily put an LED bulb in it which has a half white base which shows too clearly and looks awful. I need to see if LED's come in 'decorator' styles. Can't yet say how it works as I haven't been over at night. I just looked online at HD and it says it's made of metal. I thought the box said aluminum, which along with the Shaker style and narrow width, is why I bought it. I'll have to check the box next time I'm there. I notice a few reviews complaining that this model stopped working after a while. I hope mine both hold out, as even though not what I was planning quality-wise, I like the look. Good luck!

A "motion sensor" is a general term that can be used to detect either "occupancy" or "vacancy." The motion sensors in the two bathrooms that I remodeled in 2015 have vacancy sensors - they turn off when they sense the room is unoccupied, but turn on only with a manual switch. (My Dad would have loved vacancy switches - one of his favorite expressions was "When not in use, turn off the juice.") The GC told me I was required to have at least one light fixture in each bathroom on a vacancy sensor. I didn't question him and didn't look at the code until this week when I started planning the remodel of my 3rd bathroom. My interpretation is that at least one light fixture in each bathroom must be "high efficacy" (e.g., certified LED or compact florescent). Additional lights must be on vacancy sensors if they are "low-efficacy" (e.g., incandescent or track lighting). The required high efficacy luminaire in each bathroom, and any additional high efficacy luminaires in a bathroom are not required to be controlled by a vacancy sensor. Apparently, there was an earlier requirement that at least one "luminaire" in each bathroom be on a vacancy sensor, but I'm not sure if that still holds. In my powder room, all my light fixtures are LED, including the pendants over the sink. There's a vacancy sensor on one of the three LED light switches - is it needed? In my master bathroom, the sconces at my makeup mirror are incandescent - all other lights are LED. The vacancy sensor is on an LED light - I think that's wrong - I think it should be on the incandescent lights. I looked for LED sconces for the makeup mirror, but did not find anything suitable at the time. The city signed off on completion of the work before I had selected the pendants and sconces for the bathrooms - apparently they didn't care.