It shouldn't be too bad at all. The recommended is 18 to 24 but you know that. If they look healthy, that just means they have adapted well. You shouldn't have a problem with flowering at all.
jon.hatcher Reviewed by jon.hatcher on . Light timing problem I did my growing 40 days and i turned yesterday plants to 12/12 cycle but when changing timer i discovered it was set wrong and plants was getting only 15h 25m every day. It's a problem for flowering ? Plants will flower now? Need give 18H for some time or i am fine ? Plants are really nice and healty from 40 to 60cm, 3 X Hawaiian Snow(Greenhouse) , 3 X WhiteWidow(Greenhouse), 3 X Skywalker(DutchPassion). Rating: 5