I have a business at the end of my property which has never bothered me. Until now. They just put up lights that should be in a sports arena. How do I find out if there is an ordinance against this?

The lights are so bright that I can’t go out on my deck at night because it is blinding. Who do I call to find out? I wanted to have an ordinance in hand before I go to speak to them. I don’t want to be a jerk, but it’s ridiculous. If it matters, I don’t live in city limits.