Sorry. I don't have a suitable answer for you on that. We used a Trotec CO2 laser. Any laser engraving setup should work since you are burning off the powder coat and exposing the raw metal again. I would run tests on scrap coated pieces to figure out speed and intensity. Then apply the same settings to my final pieces.
Power LED's - Simplest Light With Constant-current Circuit
Looks great until you realize there's no code. Very annoying.