Hey Trichome...

I think that trial and error would be the best way to find out...

But honestly, I think that the Dayton is overkill with about 10 times order of magnitude.

In my cool tube, I've got one 50CFM fart fan blowing through it... and it runs fine. I'm running right now the 400W MH. If you want, I can give you intake air temperatures and exhaust air temperatures... so we can have a 'base'.

I recall that in Mellow Man's cool tube FAQ, he had a 6" fart fan (90CFM) cooling a 1000 W bulb... and he was doing perfectly fine... he could even touch the bulb with his fingers after a couple of hours!

Nothing, just a little input. Hope all goes well for you!

-turtle420
turtle420 Reviewed by turtle420 on . Zandor I Have A Question Maybe You Know Zandor I'm buying a 1000 Watt HydroFarm DayStar AC Reflector with Glass Lens, Sunlift Hanging Kit and a HydroFarm Powerhouse Switchable Ballast. Now the question is how many CFM's will it take to cool the light? I'll be using a squirrel cage fan and exhausting it through the 6" flange attatched to the reflector. I'm thinking 465cfm's Would you agree with that? Rating: 5