Will I have temperature problems with 600w?

toothbrush?

Active Member
I've been planning this SOG grow for quite a while now and want the biggest, tightest buds possible. I'm wondering if I'll have temp problems or if a 400w would be more suitable. The 400w would give ~59wpsf and the 600w would give ~88wpsf. At what point are the benefits of more wpsf diminished by cost and use by the plant? I've read that the difference in heat will be significant between a 400w and 600w but does using a cool tube and 424cfm inline negate this?
I will be using a 2.5'W x 2.5'L x 5'T Homebox grow tent (~6.9 square feet)
600W digital HPS ballast/light WITH COOL TUBE from HTGsupply, which will be vented out the top to another room
Attached to the cool tube will be a 6" inline fan rated 424 cfm (also from HTG)
Two of these: Mechatronics 120mm x 38mm High CFM fan # MD1238X12B . One intake for the bottom hole and one exhaust for the other hole at the top of the tent.
The room outside the grow tent will be 70-75*
I'll have between 25-36 plants in 5" hempy buckets (clones straight to flowering at 3") and I don't expect the plants to reach over 16"

Thanks for any help!
 
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