Ever get the feeling your caught in the middle of an episode of "He said, She said" where nobody's completely wrong and nobody's absolutely more right? It's better that talking about politics I guess. And klondike, I think it all depends on the dimensions of your grow room, but more light=better, like maybe 1000W hps for a big grow like that. But I'll leave that to the techies. For 5 cool, for 10, bigger, I think.