Firstly for a computer you will need cfls, hps/mh will be far to hot for that case and for the amount you can grow it would be a waste of power. Pick up some "daylight" bulbs with between 5200-6400k which will be perfect for veg. Try and get bulbs around 30-42w which will save power and the max amount of lumens which will help in veg and flower. Depents of the size of the case really, i would probably 3-4 bulbs per plant.

Also try and get as many pc case fans as you can and fix them to the rear of the case, that should keep the them happy :thumbsup:

Good luck