I'm not growing MJ right now since I'm living with my dad for a few months before I go off to college, but I transformed my walk-in closet into a CFL haven...

Just go to home depot and buy the 120 watt CFL lights, then go to where they have the vanity lights for bathrooms and such and buy a light strip that has 4 lights or more in a row on it. Mine had a silver finish on it and I just popped it off and voila! I had 4 sockets all in a line that I had 4x120 watt CFL going on an 18-6 schedule that I regulate using a $5 timer from home depot. Total cost of lighting, less than $50...

My current grow is tomatoes, and they are freakin huge...

[ps. make sure you put something below your plants to protect the floor. I use a 4' x 2' rubbermaid container]

And also remember to vent out your closet with completely new air at least once a day if you can.