the mh throws more heat than the hps
Thanks Kite, I would swear that I had read it the other way around. That's embarrassing.
if you are running a 400 watt mag coil ballast in an open reflector design I recommend you consider one of these
Thanks for the link, I have read a little about the CMH on here. This ballast and hood is around 5 years old and the hood does have a glass panel, it's not open. It is a 430w HPS ballast and I use a 400w MH for vegging and will be changing to a Hortilux 430w Super HPS bulb for flowering. Using only oscillating fans, I am able to keep the temps at the plant tops at 75 degrees with the hood 10-11 inches away. This is what I have for this time and I will upgrade for the next. I'm sure that you saw the photo on page 3. If I'm able to keep the temps reasonable without air moving over the bulb, what would that do for me? I would upgrade to a cool tube if it would be better for next time. This area is not a small enclosed space. It is a pvc frame wrapped with orca grow film in a larger room. The top is open, not enclosed so the heat doesn't get trapped.
for the effective range of a 400 watt flip at 35 days
I believe that I will follow that advice. I really didn't want to go another couple of weeks and since it's only 400 watts, I will flip then. Thanks.
TC and PD, your grows look so good and mine is so far behind. Thanks for the encouragement. I don't have the greatest setup, but it's what I got.