Heres a link to match's test of an XP-G2 on copper. 2.8 is going to be a little to much. I did do a mod awhile ago with an XP-G2 at 2.8 amps but I reckon I had a 1 in 1000 Led as it threw like 10 men. Another I drove slightly less was a real shocker. I have had good results running 2.2 amps. Have fun with the mod. Cheers.