Hi People, I am in need of some assistance. I have my first grow started, plants are all looking healthy and strong. i have limited space for the grow. my babies are about a foot tall at the moment, i have them on 18/6 lighting set up. when should i start the 12/12? can i do this at any stage or will the plants give some sign. i'm afraid if i let them get to big when they start to flower i will run out of space. any advice would be greatly appreiciated. i have 2 orange bud and 2 dutch cheese.