Yeah.
Seriously, yeah. Whats the difference in the electrical bill where you live, like $1.50/week? From what I gather, the 600w HPS is the one to get anyway. Somehow they managed to make it MORE efficient than the 1000w HPS and I've heard the 600w has a slightly better spectrum. On the other hand, I picked up a 250w HPS and switched the bulb out for a 250w ceramic metal halide last night. Looks a lot like a MH with a slight pink tint. The plants seem to love it already! I hear they make 400w CMH bulbs as well so might be something to look into, though it'd be more for vegetating, not so much flowering.