About a year ago I installed 3 motion sensing light sockets above each landing in my multi-family house. The light goes on with motion and turns off after 4 minutes. Here is the link if anybody is interested ( http://www.gadgetgrid.com/2007/10/25/first-alert-motion-sensing-light-socket/ ). They install directly into an existing light socket. All three are daisy chained together on the same ckt braker. I'm having trouble with one of them. When the light bulb blows it seems to affect the sensing light socket. After replacing the bulb, the light will not go out. The trouble shooting guide tells me to shut off the comercial power to the socket and the device will reset itself but that doesn't work. I've replaced the unit once already and do not want to spend another 30 bucks. Any ideas?