I did not attack you personally and i gave you the answer you're looking for. In case you don't remember, you'll have an incredibly hard time yielding more than 1 gram per watt per 2 months. So a 400 watt will not yield more than 400 grams in 2 months. That's about 14 ounces if you have a near perfect grow. If you find that after a few rounds that you can't yield more than say 8 ounces per harvest, upgrade your light. But understand that 1 gram per watt on any HID out there is about the max that you'll ever do. I apologize if I came off like a dick as my pet peeve is internet forum ass-holes and I hope I wasn't one. Cheers.