I am not stating that anyone is wrong here. I will simply state what I have seen work. "They all work" is the simple answer here. The only difference is in the grower and the product. I have seen plants turn out great under many different light cycles. I have noticed though, a lot of plants will grow better under certain and different light cycles. I have also noticed the plants grown with a dark period will grow much sturdier and stronger. This is a debate that will go on forever. I suggest everyone just try out what works best for them. There are so many factors that can contribute to different light cycles but the grower must go through trial-n-error to figure out what works best in their situation.