yes, desertrat is right. Remember, you will have to make sure you get a fan inside and adjust the humidity.
If you're still bent on going ahead with it - get about 2-3 of those bulbs, it will be more or less ok. It's a shame that you can't use the hps lamp... The result would be so much better than with cfls.
Are you sure you can't make the space bigger? Making it higher is the priority, as for width.. Well a few inches will definitely help. I hope you can manage; it's always nice to see people succeed in growing!
When i first started out a few months ago (my first grow), i was going to do it in a wardrobe but decided to do it in my bathroom shower instead - how right i was! (it's the shower we don't use). It's pretty much a ghetto set up but quite good for a first time (if i may say so) - take a look for yourself.
My girls are 3 months old, going to veg them at the end of the month. My lamp is only a 250w hps, also got a simple fan and a humidifier. With a little imagination, one can acheive great things!
Anyway, for the sake of it, i must admit your grow is fucking stealthy! Haha
pity it's not the right size.. But nevermind, you'll figure out something, eh mate?
Keep us posted,
-rich
She bulking out nicely. Also the LA women is going to sprout soon and im germinating the other Easy Ryder.