It's all over the place... best way to use cfl's is to get them as close as possible without burning the plant, up to within an inch from the plant. Their effectiveness decreases dramatically every inch the light has to travel. Text <-- more info there... even got some reflector ideas for ya. They explain it pretty well in there. The cfl's give off 360 degrees of light, so they use a soda can to wrap tightly around the bulb. That might actually give some sort of reflection since the can is an inch or less away from the bulb. The way I was picturing yours is that you would use one bigger reflector for several bulbs, maybe not as efficient... or maybe I just misunderstood your idea :jointsmile: