Need More Lights

Hey guys, Sorry i don't have any pics so you are gonna have to use your imagination on this one.
I have a grow box (12" wide, 18" long, 30" tall"
I have 2 plants in there now and that is all i plan to fit in there at one time
i don't think i have enough lights
right now i'm running 4 25 watt cfls, running right out of a power strip (one power strip on each side with 2 bulbs)
I was thinking about taking all of those lights out and adding 1 or 2 full size fluorescent fixtures (as full sized as can fit in there)
that will give me better light distribution and more wattage
but my main problem is i don't now if that will fit in there
do they make fixtures that will fit in there?
if not i'm thinking about adding another power strip in the back of the box and another one in the front
with 2 more lights on each
any help is appreciated
Thanks a ton

I haven't found any fixtures that short suitable for growing, but you can always just add higher powered CFLs in there. Home Depot sells 105W 2300K CFL bulbs for like $13 I think. They are bigger, but small enough to where you could prolly fit up to 6 of them in there, but two would do you fine, I think.