yes i agree with ev1 here about "daylight for vegging" "soft or warm for flowering" but im using 7 warm cfls @ 27w pr bulb, i have 8 plants 2 weeks old today and they look good. al walmart you can pick up the bulbs "27w "daylight" cfls' for $5.25 a pack ( 3 in a pack) thy also carry the Y adapter so u can screw 2 bulbs into 1 socket, very nice thing to have if your going cfl, also they carry electric socket adapters, small plug that can go into any electrical socket or extension cord with a screw in socket for a bulb. With those 2 things u can plance bulbs ANYWHERE, again i only have 7 bulbs for 8 plants, Just for vegging tho, will be getting 6 more cfls once i sex them for flowering, check my journal, the results speak for itself, best of luck in your growing.