i use to use (still have em) these large cfls i got from home depot. they pull like 68 watts ea, and are 300 watt equivalent, in a 2700k color. 14.95 ea. then for ten bucks each, u get a aluminum clamp hood/cord combo, and u have alot of lumens over what you have now. however, i have found if i go cheap, i allways move up anyway. heck. i grew for 2 years with a 600 hps. now its a 1000. at this point, is when i took down my 4 cfls. right now, they are getting hit with 155,000 lumins.