I have been running my lights at 24/0 and it looks like the girls need a rest. They showing deffs and a light-green color wich probably comes from me being a terrible boss and never giving them a break from the intense lighting. I have now switched to 20/4 to see if it will make a difference. They don't have so much head-space, some just having 25 cm from the bulbs wich is not recommended when running 600w hps. The shorter girls shows a touch to much lights but are growing and producing nice buds, just like the early finish OG Kush, nothing wrong with her as pictures shows.
My next grows I will keep canopy at a much lower level using LST, and supercrop if needed as I can't raise the lights more.