Air-cooled hood...can you pull too much air through?

[jakester]

Reading this gives me cause for concern.
I've got 3 enclosed 400wt hps lamps all being cooled by a 4" ActiveAir doing 165cfm. The glass on the hoods gets too hot to touch if feeling directly under the lamp. They're moderately warm as you span out from center. Is this too hot?

So is my 165cfm under power for cooling 3 lamps?

The glass should be hot. Is the space too hot for the plants? You should have the plants about 8-12" from a cooled bank of 400s. You should be fine in the winter at lower cfms.