lumens are what's important here, and cfl's have plenty of them. That "28 watt" bulb emits near 5 times the lumes of a 100-watt incendecent bulb. And I'm adding one more tonight...

someone wana look at my gal and tell me she looks unhelathy?

what features strike out to you as lack of light on my pics man?

as far as the yield, come back to this thread in a few weeks and we'll see who's right..until then back off...plenty of members have grown sucessful single plants under one cfl, all grow guides state "try and have at least 25 watts per square foot". Well guess what? my gal's just under a square foot....hmmmmm....and you said the bulb emits only 28 watts???? well according to your theory i'm still ahead of the game, and by the way bro, watts is the energy the light is using, not the amount of light the plant is getting, that would be lumens buddy :thumbsup: