Light fixture blocking motion detector

I wanted to put my motion detector in a corner that can detect a good bit of space, but there's a light fixture in it's sight. I've tried testing the motion, but I couldn't get an idea of the range because I hadn't put it on the wall yet. The yellow square in my picture is where I want the motion detector to go. Is it possible to get an accurate range of motion even with a light fixture in the way?