I think it's a common mistake people make with their security lights. They should be angled so as to light up the wall and of the house they are on so that if someone looks out of their window on hearing a noise, the intruder and his actions are clearly visible. Mostly people tilt them up too much so the wall or doors or windows are in relative shadow, and the light shines in the eyes of anyone trying to look, meaning they can't see a wretched thing! And you don't have to put the sensor facing the same way as the light anyway. We had this problem with a neighbor backing onto our garden. He put up a new light and it was shining straight into our kitchen blinding me even in the daytime. The sensor needed to be exactly where it was, but he repositioned his light to point down his side bit instead of across it at me - this in fact covered his garden a lot better.