you are better off making your own fixtures, that way you can position them as you see fit, pre-made things will only allow you to put the lights where THEY want you to put them. One can NOT match inside amounts grown to outside amounts grown (you will NEVER grow 1 plant indoors and match what I can do with 1 plant outdoors, when you average over 1 pound per plant indoors let me know) and it helps to not have to pay rent, all my stuff is paid for and I live on a big farm owned by my family so that help too.
You can get a simple plastic old-type pull-string fixture mount it to a piece of wood drill a hole in the back of the wood for the electric wire and mount it to the wall of the closet, you can do this all the way up the side and mount as many lights as you can this way as long as it doesn't over load anything electrical you will be safe, but you WILL have to keep a eye on the heat regardless if you use CFLs or not.
Remember this: Slow and steady wins the race, little bit along will get you what you need and you don't have to be in a hurry or get big to get what you want all you need is patience. Also it's safer to take your time with this too.