First off, LUMENS DO NOT ADD UP, look it up from a trustworthy source. i heard a good analogy once. its like two cars on the highway, if two cars going the same speed merge they are still both going the same speed, whereas if another car comes speeding up at twice the speed he would fly by both cars. or like a machine gun firing at a brick wall, having two makes no big diff, but add a canon and blow the whole wall down. Just the same adding more small cfl's just gives you MORE low intesity light, more evenly spread, thats the only advantage. But I assure you, the highest lumen bulb one chooses to use trumps the smaller ones in intensity. Oh, and 6500k daylight spectrum is FULL spectrum light. 4100k cool white still resides mostly in the blue spectrum, and if anyone would read the first post I am adding another light later on.
oh and my plants stay at just the right temp, thanks