I'm starting to think that training plants to stay down and running lower wattages is the way to go, like you are with the 2x250's. I've heard reports from some growers than get amazing yields this way, using SCROG technique. If the plants stay reasonably low, what is the need for higher wattages? I have a 600 hps now and yes I can flower a 3' plant quite nicely, but we're not growing for looks indoors
I had a similar experience with Hid Hut. Their budget line stuff is functional but cheap, I had the wiring burn in a reflector socket due to one of the wires being loose. They offered a free bulb with my next order, but I fixed the reflector myself and didn't order anything else.
I think this damage comes in shipping, UPS and the like take great sport in hurling and slamming packages around, I have heard that firsthand.