Yeah, I use a t5 fluorescents 110 watts. I can fit 4-6 plants under there when they're small. 2 if they're bigger. I also have a few clones just under 2 26 watt cfls and they're doing fine. Make sure they're actual watts though, not equivelants cus you'll need more if they're 200w equivalent cfls.
yeah I use about 16-24 26w cfls during veg, saves alot over a mh and I can place them where I need to instead of one mh hanging, then follow up with a 600 hps followed with a few 23w 2700 cfls for fill in light during flower.
sure you can, use 6500k, the sides of CFL's are the brightest part of the bulb so be sure you set it up that way