Cloning light regimen

Do clones have to be lighted 24/7,18/6 or could a guy clone under 12/12.Ole Ed Rosenthal says clones may be taken right up to harvest,this is when I'm taking clones when I harvest wonder if 12/12 will work.

i read from the same source Ed R. that if you wait till 12/12 you need to go to 20 hours on 4 off and about 6 weeks to see it re vegitate instead of the 3-4 it would take if done at veggie state. NOW where is the new post button please!!!!!!!!!!!!!!!!!?