I bought two of these sensors for a customer, one for over the garage door 20 feet up, and on for flood next to front door pointing towards driveway.
This is now the forth time I have been called back for miss operating sensors, the garage one just stays on and the front porch one works,,,, then doesn't, then just stays on. Sensor is mounted below two 90 watt floods in a red dot box with sensor set to half, 1 minute cut off, with boost off.
Never again will I use these sensors, went the electric supply house even they said they were junk, and directed me to a Rab-Stelth STL110.
http://www.amazon.com/RAB-STL110-Stealth-Sensor-Degree/product-reviews/B0027OWGL8/ref=dp_db_cm_cr_acr_txt?ie=UTF8&showViewpoints=1
They are twice the price, but are the real deal, will chime back after install & some time.