Auto repair stores sell a lot of 'offroad use only' equipment that people use on the roads. There's no effective enforcement for proper headlights. You're unlikely to be stopped because your lights are too bright or pourly aimed. Many (most?) states don't do a periodic safety inspection, and if they did, you could swap in stock headlamps for the day and then back to your super bright things.
> you could swap in stock headlamps for the day and then back to your super bright things.
That's why it is penalized by driving license cancellation in some countries. And people do get stopped for too bright headlights, because it's so easy to notice and check.