lighting change

i started with the 20/4 on my first grow and then switched to the 18/6. i am currently doing the 18/6 and like some of the guys said i think most of your plant growth is when your girls are sleeping. i saw a bigger diffrence in the 18/6 than the 20/4. eather way you good good luck.

The most important consideration in all this isn't necessarily photoperiods, it's determining if you have reached the point of light saturation whereby less becomes more. A plant performs better with less light over a longer period of time than intense light over a shorter period of time. East sun is better than west, etc. The amount of photons received by a leaf just before chlorophyll degradation occurs is what's important. Bleach out the chlorophyll, and you done screwed up.