Thanks HD. As I had mentioned in another thread, I may be moving in a few months so I'm not going to go buy an hps or more cfl's because of that reason. And if I was going to I'd just buy a 250hps (because I think a 400 would be too much heat for me to deal with in the space I have).

The reason for my question was because I wanted to know if one plant with all the lights would yield as much as two plants with all the light. Thinking (that was my problem right there) that because of the reduced amount of light available for each plant that it would impact the yield. Thus my comment "do two halves equal a whole".

I actually stuffed a 4 footer in there and am puting another 2 footer in there today. Will go with that as I think I'll just have two females as the third plant looks to be going the masculine way.