Mirrors melt and break when hit with a laser of more than "pretty lights power".
This dude built a 2kW one with optics: https://www.youtube.com/watch?v=xNmbvaUzC8Q
mirror at ~ 4:30
EDIT: I know where I am, that video is too good not to share though. Vote away.
Recently got Mad Max from GOG. It's pretty great for Open World car combat and Arkham style brawling. It also runs great. Too bad it didn't get more attention.