Athosanswered grow question 6 years ago Lowering the light hours will not hurt the plants, but it will make them develop slower, for the simple fact that they will have less light to take advantage of. I would wait a week or two before doing anything, just to see if it starts flowering or not. Even then you would have to make a decision: (a) keep the 4 autos that are flowering and cull the other; (b) Let the AK47 veg while the other 4 finish flowering and then let it go to 12/12 on it's own (would require some training); (c) lower the lights to 12/12 so everything flowers at the same time.