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I have 3 660 ballast with three 80 watt bulbs on each and the pull is all different on all three. I'll have to go home and check again to tell you the number.
Both of my self made frame are all very open and nothing is enclosed, the only form of enclosing is the reflector themselves. I've tried multiple ways of using air cooling for MH and the most effective way is evaporating. I've tried directly blowing at the bulb, across the tank, and on top of the water. Turns out on top of the water is the best but evaporation is significantly more. For T5s i can blow on the filament side of the bulb and the reflector channels the air to the other end. So from my experience cooling MH is extremely harder. I can throw 100cfm on a MH bulb and there is no way i will be to touch it, on the other with T5 hand minimal cooling i can touch it.
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