Assuming you'd have appropriate cooling, I'd look for a way to use 2 x 600's. I'd also use digital ballasts with selectable output for more control. They key is always keeping the space cool and well ventilated. Myself, I use 2 600's and 2 t-5 panels (4ft - 8 tube) to provide a light footprint of 7' x 4'. All are vertically adjustable giving plent of flexibility for a varied canopy with a maximum of about 6.5' to the bottom edge of the reflectors. The room is 6.5' x 13'. I use 15k btu window ac unit on a timer plus a 450 cfm exhaust fan on a temp controller. This keeps it in the 70's with lights on.

Good luck!

Farmer Rich