Yeah, what PC said ^^^ and if you have to schedule them to turn on/off on a certain schedule, it's better to give them a bit more dark-time than extending the light period. And follow the instructions for transition nutes like PC says....

I give mine 12-24 hours (or more) dark time before I flip them so that I can get them on MY schedule (7pm-7am for flower, in my case) rather than I have to get on theirs... make sense? If not post questions and I'll come back and confuse the issue even more....

MVP :jointsmile: