I post this regularly, but I will again here.
I saw an experiment play out with 3 clones, each grown in a different light cycle... 18/6 20/4 24/0
20/4 was the best plant at harvest.
18/6 was right behind it.
24/0 sucked.
I use 24/0 when I first start seedlings, as soon as they break surface and open the little sucker leaves, I switch them to 20/4 or 18/6 depending on weather. During summer 18/6 so I don't have to spend so much time cooling it. During the winter 20/4 to keep that heat a little longer.