im doing an all cfl grow in my closet, i got 6 cfl's on 2 plants (1 a few weeks into flowering, the other a month into veg).. i think 4 are fine for now but once it really starts to get big and fluffy and tall i would totally add more lights. i cant stress that enough because its something i should of did in the beginning. now my bottom flowers are taking a huge hit.
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i would do hps but i live in a apartment so 1) the electric cost would probably kill me, 2) the heat, 3) cant afford a hps. So im sticking to CFL's
ps: dont let ppl on here push u around and tell you to get this and that. they dont know how much total you have to spend on your op or living situation. everyone will tell you to get a HPS, including me, but if it isnt in the cards dont stress yourself out. work w/ what you have for now, save a little, then use what you know from your first grow and carry it over to the 2nd op. thats what im planning to do. knowing what i know now, plus im saving, my 2nd op should be a really good yield.
good luck man. id go w/ 6-8 lights
edit: just saw u had more then 1 plant. lololol. sorry, wake and baked so im a little woooo.
i was told 2 cfl's per plant.... 1day light, 1soft white in a Y adapter 4'-6' from your plant (if u hold ur hand under the light between the plant, and its too hot for your hand, its too hot for her). once it starts getting bigger, when u see light really isnt reaching the bottom parts of your plant, add another set of 2. day light and soft white. if u go with cfl's the whole way thru keep adding sets of 2 as it grows, and watch to make sure they arent too close so it doesnt burn the plant.
but then if you do go w/ HPS, after about 40 days(?) or so switch her over to hps and u should be good to go.
hope this helps a bit. good luck!!