thanks man. So say I did buy a 1000 watt though. How far from screen should it be?

i was figuring 1000 watt because I will upgrade again in the future (box wise) so why buy 2 when all I need is one.

so with a 1000 watt bulb it would run me around 83 watts per square foot.

or maybe I will just build a 6 x 3 x 5 instead that would be cost effective in the long run. Would be 18 square feet instead of 12. bigger scrog mean more buds.

thanks for the help. I think my head stright now.