I am currently growing 8 plants under 400w of cfl. today is the first day of the sixth week flowering, and theyre lookin pretty nice, couple dense tops whatever. I want to upgrade for my next grow, should I go with 2 250w hps, or 1 400w hps? my room is 5' long, 2.5' wide, and 30" tall. i plan to cool tube whatever i get, if that makes a difference idk. some help please!