I have 2 of these lights out back that I got from Home Depot this spring for $20 each. I love them and will definitely be getting more. They are very sensitive. My chickens set them off as do cats and my chihuaha. The only thing I don't like is they don't stay on as long as I would like.
I like having lights out back in the runs and having the yard lit up some. I did turn off the light in the back hoop coop cuz I think it's keeping them up.