The lighting company that replaced our HId with t-8's used a sensor on each end of the asile, and one in the middle of the asile. Our ceiling vary from 30 to 35' tall. They dropped 1/2 conduit from the ceiling about 2-3', then mounted the sensors at an angle into the asiles. In the center, they dropped 2-3 ' and put a round sensor. In the main asiles they have round sensors. I do not have the type of sensors. They seem to work ok for the most part, However we had a new roof put on and the sensors became misaligned, and we have not adjusted them yet.
