I have a 400 watt metal halide, and also a 4 ft. cool white flouro fixture for sidelighting, and 2 cfl clamp lamps which I also use for side lighting (the other side). No heat stressing evident. It's mid 70's at the canopy level. It's a Cool Breeze fixture with digital ballast.

Yes my entire grow has been bizarre hasn't it? I think I've had every problem in the book and I just hope it's not stressing them too awful bad..

I've been able to remove the tie off. The problem is with main fan leaves as big as my hand with stems as thick as a pencil, thats a lot of weight down on the branches which I'd been training up so carefully.. argh. What next?