My last cover band had 2 T-bars fully loaded with the Thomann PAR56 LED cans. They did the job. They're not spectacular quality, but what do you expect for the money? We had trouble with a few of them where the plastic nut on the inside of the can slipped off the power cable grommet, meaning there was no tension relief on the power cable, and they weren't easily taken apart to fix the problem (although I managed it in the end). Other than that I can't really complain. After playing under normal cans for a while the LEDs made things much more comfortable, temperature-wise. They wouldn't have anything like the same light output though...