u can go to b&q for cfls they are cheap and will b good for a p.c box, like burbsking said m8t do sum reading, get the money cfls are the way 4 u trust me?
12/12 light cycles are for flowering plants only!! you need to keep them on either 18/6 or just do it the easy way and keep them under 24 hours a day. you need to keep them in a veggitative growth state for atleast one month or untill you run out of space, keep in mind when you do make the switch to 12/12 the plants will grow 2-3 times in size... from reading your post on this thread whitemarley it seems like you should do a massive amount of research on growing in general.. go read the "getting started" article in the growfaq..
cfls are fine for expimenting but when you want to grow bud the right way you need to invest in a HID light!!