Thanks for your reply. I turn it on at a thousand and always leave it at that setting. But now it turns on at 600. And stays there unless I lower to 400. But No difference if I go up to 1000 though. I've contacted the company and they are willing to replace it if I send it back to them. Which is laughable considering what I'm using it for. I'm 5 weeks into flowering, they were looking fantastic. this is not the time to put them under cfls while I send back a ballast and wait for a return ballast. They are already starting ti droop one day later. I was also given the option to pay them 80 dollars to get a new one and get refunded after they inspect the original one. I've owned this set up 2 months and its also under a 2 year warranty. Not sure I'm willing to send them more money to fix a problem that is theirs, not mine. As a side note, I was told by their representative that they usually tell their customers to have back up equipment in case theirs has a problem like mine. I pointed out that I was never given that option. And I've never heard of any business making a statement like that. Although it makes sense in hindsight. It sure seems odd that a company would say such a thing about their products. Hence my reluctance to send more money. My next purchase will be from a more reputable source. "Long live Jon lord"