yeah, five will definetly do alright. i thought you just had one which would produce less than favorable results. getting more will do alright for flowering, but if you shop around you might find some 150 or 250 hps's for cheap. i figure after you buy bulbs, sockets, wiring, mounting shit, ect for 5 cfls you might have close to enough for a cheap hid lamp. i hear you can get 'em for less than 100 bucks these days and they are definetly worth it, just think of he weed you WONT have to buy. my opinions, hope they help, sorry for any negativity.