I have a Digital Greenhouse brand 400w HPS digital ballast with air cooled hood. Its worked great for about a month on 12/12, but now shuts down randomly. The ballast is even cooled, I built a duct around it to flow the exhaust air over it.

The top of the hood maintains a pretty steady 90 degrees F and the ambient room air is about 85 and no higher. Could I have gotten a cruddy bulb that the ballast is reading as shit so it cuts off. Or do you think my ballast is going tits up. I will call HTG tomorrow and try to sort it out. Fuck about halfway through flowering too.