I installed the cam behind a window, in my garage. When I point the cam straight ahead, at night a big white spot, like from a brgiht light blooms dead center. If I turn the cam away, the spot does not move with the cam. 

What I can't understand is, where does this light come from?

If it where from the built in IR LEDs, imho it should move with the cam, which does not happen. 

I tried to capture it with my phone, but from the other side of the window, there's nothing, except two tiny red spots from the IR LEDs. 

Any ideas?