I think it all depends on what you want out of your grow.. there are a lot of factors to consider when u think about it, mainly how much you want to yield.. i have 4 42 watt cfls warm white i think, and one 26 watt daylight, and since u need them pretty close ( i have 2 plants ). I have 2 one, a 26 daylight and a 42 warm white, and 3 on the other, growth isnt amazing.. but it works just fine.. since its my first grow i dont know how much they will yield but i can garuntee that it wont be as much as a hps, plus the number doubles when comparing lumens per watt.. so its really up to you