If your going to be growing 4 plants you should use CFLs and somthing else... depending on the size of your room and the setup you have... you might wat to go to home depot and for 30 bucks each pick up 2 50w HPS spotlights... or for 30 bucks a 65w CF Floodlight.. and then buy some 42w CFLs for 10 bucks each... I got one plant and 4 42WCFLs... thats the biggest they come in stores... and 3 32w CFLs... planing on getting some floodlights and growing 2 or 3 plants...