There is a thread at Effects of different photoperiods on flowering. - International Cannagraphic Magazine Forums with an experienced grower, Blckbrd, using 24/7 and 7/12 photoperiods. He claims identical results with less power consumption and 25% lest time. "I really do it to just speed up the harvest time. I like genetics that take 70+ days to flower and the 7/12 cycle is about 24% less time ( over two weeks less ) of flowering time. The finished product is huge, dense, and true to the genetic expectation. I have not observed any detriment at all."