Yeah, that 400-watter from htgsupply is the one I have. So far, it's been great. The bulb burnt out after one day for me though, so I called them up and they replaced it for free, with a better bulb that they sell for like $60 on their site. I haven't had a single problem since. The magnetic ballast does get pretty warm, but it runs way cooler than I expected. They say their ballasts only add about 20% more energy to that of the light, and from what I've seen, that seems about right.