Most grow guides will say that the cool-whites are better for vegetation and the warm ones are better for flowering. Using a mixture of both will be fine though. I've heard of some people using mostly cool-whites with just a couple of warm-whites during vegetative growth, and then switch round during flowering so they have mostly warm-whites with just a couple of cool-whites. It's to do with the spectrum.
GTC21 Reviewed by GTC21 on . Cool Vs. Warm Fluorescents Which is better to use? I'm using one of each. Is that the way or should I just be using one kind? :rolleyes: Rating: 5