Bud the best advice I can give you is to stop using hps and switch to led. You will save more in the end by going led than will cutting light. The light will pay for itself in a few grows. I think the sweet spot is 20/4. I do 24/0 in winter for the heat like Mizzo said. I have to say I dont see a difference in growth between 20/4 and 24/0. Anything that is living can use a little rest in my opinion. They grow in 24hr of light in the artic because they have no choice. If they could rest I bet they'd love it lol. And doesnt it get kinda dark in some place that are 24hr of light? I saw something on TV where they were in 24hr of light but it wasnt bright very low light. Was early am looked a lot like dawn but was like that for few hrs. Play around and report back. Sometimes you just have to do it yourself to find out.I use 18/6 light schedule my whole first run. Running 1000 watt hps so try to save on electric costs by cutting it down 2 hours. Was just wondering what would happen running 12 and 12 with autos. Thanks for the replys. This is my first run with autos as I've only ever grew photos.