In veg, you want NO MORE THAN 6 hours of DARK.
In flower, you want NO LESS THAN 10 hours of dark.
Most people I know flower at about 1/2 of the finished hight. IE: if you want 4ft plants when they're finished, you should change to the flower cycle when your plant reaches 2ft.
This is not true for every strain. Sativas may grow taller, and some indicas may not stretch as much, but 1/2 is a good starting point.
psteve Reviewed by psteve on . could someone explain the light cycle to me please ive had my clones i bought from the club for about a day now. i have 2 150 watt plant lights and two 15 watt florescent lights in a closet. ive heard that you keep the light on 24hours a day until it gets tall enough then you go to a 12/12 cycle when you want to flower it. is that true? im also new to growing i have peters food diluted with water, and some doom lite lime. One of the senor members told me i should put a bag over the plants so they wont wither, but how long to i keep the bags Rating: 5