Here's my take - for what it's worth.

First of all, Bonger and u.g.u. are both right. You are going to be drawing quite a bit of power, so, bring a decent sized sub-panel down to your basement and run all your wiring from there. Then, as u.g.u. suggests, use 240 volt whenever you can.

Second - I just had a long conversation with a friend who's using 600's in hydro huts. He likes to keep his plants under 46 inches tall but he was complaining about the penetration of the 600's. Although he grows really good bud, he just couldn't seem to get the buds as big as he wants. He also said the lack of light penetration was obvious on the lower buds. So, you might want to consider using 1000w lamps.

Finally, I have cool tubes and they are ok for certain applications. However, you are talking about having a cool tube with a reflector over it. Just buy cooled reflectors. Aside from the fact that you'll save money, reflectors are probably better than cool tubes for your application. (The cool tubes tend to put out light all over the place, which is good for a small area with reflective walls, but the reflectors direct the light downward, which is better for your big room.)

If you can, find the thread "xcrispi's current growings on" and check out his hydro set-up.

Good luck. :thumbsup:

PC :smokin: