Man you better surround those baby's with 2700K. Home Depot has 40w 2700k cfl's if u look closely among all those bulbs, way better than the 23watt as far as lumens. But their 10bucks a bulb. I took the pinch because I had the fever bad and wasn't going to be deterred. Be ready to adjust, adjust and adjust again. This will be your nemesis a few months down the road but stay committed. I screwed my hangers to the ceiling and it looked like a woodpecker orgy when it was finished. Seriously I had a true 250w on top and as many as 16 of the 40w cfl's dangling 2-3 inches around the sides...wherever there's a dark spot plug another one in. Amazon sells a 4 bulb holder cheap that helps tame the sea of cords. Do it when their better, a week to these plants means a lot.