Sorry, I had to cut and run real quick earlier. Rather than another 1K and have to deal with possible heat issues in summer or even now, and getting light, ballast and hood, I would think about a light mover and put those buckets in 2 rows of 6 if veged for less than 3 or 4 weeks, give or take the bushiness of the strain or if extra bushy and veged longer, then do 3 rows of four and that light could hit them all and be real close since it isn't constantly heating up the same part of the canopy. That's just my side line two cents. Of coarse I would change a few things in my room, but it's like a hot rod, one thing after another in search for the perfect room.
Well doing a med grow, do you have any goals in mine, a yield range to make it worth the work and to supply meds for a particular length of time? Just keep up the good work, and if your using the GH 3 part I would check this out http://boards.cannabis.com/showthread.php?t=93676 it is a thread by LateWood explaining a nice GH formula that he uses for pretty good results that I am going to try my next nute run.
Adieu