Hey, I use CFL's right now, i have one 150watt CFL for each 3w x2.5d x 3h and it works great! if i had a bit more room and had a 4 foot wide box, i would use some T5 fluorescents. You can get a 4 footer with 4, 54watt lights for about 180 which is a wicked deal and it gives you nice even lighting. Anything smaller i would recommend CFLS. I also use 3 -250watt Fluoros for flowering and they work amazingly! so good for a small room, very little heat and big buds! best weed ive smoked in a long time!
Feel free to ask any question, ive spent the last few years learning to grow and its been really hard, so i really dont mind helping you get started! Cheers