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

[EvilCartman]

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?

If it's working for your space, then I wouldn't worry too much. If the plants are happy, run with it.

But, IMO that blower is borderline *at best*. Depending on the number of bends and the length and type of ducting, you're moving significantly less than the rated flow. Check the seal of the reflectors, any leaks are reducing useful airflow. The glass should not be "too hot to touch" anywhere.