I just installed a wired spotlight over my garage doors. The garage is separate from the house, so I have a garage door opener mounted on the wall next to the house door. It stopped working, so I changed the batteries. I thought I had that fixed, but it stopped again. I had an epiphany and, sure enough, it turns out that the opener will not work when the spotlight is on. Not at all. The two inside my cars do a little better, but their range is severly shortened when the light is lit.
Other than just taking it down and replacing it, there doesn’t seem to be much I can do about it.