1.) I've read that it doesn't help with the reverse camera, however I don't have any real experience with it.

2.) I replaced the inside hatch lights with similar LED light/housings (18 LED from Dash) and it is bright. I like it a lot. However, I think it would be way to bright for the license plate. I prefer not to have my plates lit up brightly. I definitely think it will be much brighter than any manufacturer OEM LED license plate.