Congratulations on forgetting the justification people are using to restrict light brightness, which is that is blind other drivers dangerously.
I would consider motorbikes and bicycles to fall under that category, but I expected that people understood that I wasn't going into the minutiae of a hypothetical regulation that I'm not responsible for writing. There are, of course, lots of edge cases that I didn't include.

If you're making a case for pedestrians, or people indoors, I think that's gonna need to some more serious justification.