Those look great man. I personally believe that a broader spectrum might be better, and I don't know if anyone else has said this. But throw some 2700ks and 5000ks in there, and they'll love it. Shoot right up man.
Also I don't believe in only placing lights over head. I think throwing slightly weaker lights than the over head lights discourages stretching, yet still properly feeds the plants with CFL lights.
Classy set up man! Not worried it'll catch fire bein card board and all?
Chronic, there should be a link to my journal in my signiture if you're lookin for more ideas. Walmart shelving unit wrapped in black/white poly. Looks to me though your little buddies are doin fine in what you already got goin for them.