The plants were anywhere from 15-18 inches and actually, only two made it into the flowering room and THEN, one of those turned out to be male. I think it was a hermi actually. We used 400w MH for Veg and 400W HPS for flowering ( right now ). Yes, they are on 12/12 and have been for 3 weeks now. We actually had some mishaps so our veg cycle and how fast they grew wasn't accurate. We have started a whole new grow now of AK-48 and Bubblegum and some of those are 24 inches after a month in veg ( Also, We switched to FLorescents AND MH for vegetation on this grow and for future grows ) . We just ordered a 1000W HPS for when those go in the flowering room. The one plant we have left went in at 18 inches and is now 4 feet tall. I hope I answered a lot of your questions. The one plant that made it all the way through is NWW btw. The next 12 about to enter in the flowering should be EXCITING!