I have not seen a dimmable 1000W that you can take down to 400W--what brand is it?
It is a Sun System Galaxy, it does 400, 600, 1000 and has a turbo mode that will do a little more than 1000 but they warn that it might decrease the life of the bulb. I seldom post here but I read alot, i watch THG and HL among a few others the most. This is my 8th grow and I am still learning. My last harvest was .72 grams per watt and that was after throwing away some due to bud rot. I bought one of the ballasts 10 months before the other two and the first one has the interference and the other two do not, I wonder if they have figured out the interference problem. The interference that I am talking about is that it messes with my meters. Thanks for everybodys help here!!!