you could do a cfl sea of green hehe. if it was a 4'x4' sea of green i could see you;
-'4x4'
-line the ceiling with 16 45w bulbs laying down, and have them is line/rows of 6. having 6 line/rows total
-you would need a 18" fan oscillating and blowing at the lights to dissipate heat
-you would definitely need a little ac or some kind of air duct system with maybe 2 18" fans sucking out air from 2 holes cut out from the side of a wall on top. also to keep all the light from coming out you could, use those big flat carbon fiber filters at home depot/lowes/ace. their actualy ac air intake filters for inside.
*I had a set up years ago, it was similar
-5'x2' @467watts. basically 20 23w cfls and 3 fans;
-5'x2' box/cabbinet
-rows of 3 on the ceiling, i had the cfls screwed into sockets that had a plug on the other end, they were 1"x3", those plugged into power strips that plugged into a main heavy duty power strip, and then to the wall. fans get their own plugs from different outlets. i found that if i used one plug the lights wouldn't get as blinding as usual!
-1 12" fans blowing from the ceiling, it was on far left side of the roof, it was angled at bottom corner diagonal from its position.
-another 12" fan, this one mounted on the center of the left wall, blowing straight into my plant
-another fan sucking air out mounted on the center of the right wall.
-10 gypsy nirvana short ryder(which i wont buy again cuz most autos are mini and not worth while), solid dense weed, very very crazy on the flowering spots, one plant had a branch every 3/4 inch, it was insane... too many flowering spots, it eventually got mold when it didn't go back in its box for a week. mold that almost took me out!
i have no pick but i have this: