You can switch the lights whenever you want but you also want the plants to get srtong enough to be able to support the buds. Your stems are not verry thick and they are stretching to get to the light. Get that light as close as you can with out burning and then they wont strtch to get closer...also you want to have a fan on them oscillating. The fan will be like yhe wind in nature and the stems will get stronger from trying to resist the wind...what about food? got anything to feed them? do you have a way to check P.H.? Do you know how to distinguish males from females...also things you want to know bwfore hitting that switch. God Luck!!! :smokin: