In addition to that last question, any experienced growers estimate about how much these will yield? Around 40 bud sites on each where hairs are forming, and both are over 3 1/2 ft tall, 250watt hps. Some hairs are starting to turn red but just a few and mostly on the bottom buds which are receiving less light. They currently are on 12/12 can I put them on a longer dark period to speed things up?