Cooltube as vent...

Well, i dont poses it yet. But your saying what im doing would work better with a reg box hood... how so? Would it keep better temps?

I think the point is cooltubes are supposed to be totally enclosed and constantly have air wooshing thru via vent tubing, I think you'd be better off with an squarish airtight reflector, like a Cool Junior, you could leave one side open, but traditionally, you have the hood cooled and a seperate outtake pulling air thru a carbon filter, what I did was had a fan on one side of the reflector blowing past the light, thru some tubing attached to the ceiling and it just ended right next to the carbon filter, sucking the hot air of out of the room.

If this is your plan for your setup then dont bother spending the extra money on a cooltube, its only cool if you use it correctly. Buy a cheaper fixture to go with your cheap idea.

Ehh, idk... it does make sence IMO. Because its still getting the idea done... just differently. Rather then just pushing air over it, your pulling air over it. My rooms not very big, 26CFM is MORE then sufficent enough for ventilation. With it open (no reflector) then A) less light (DUH no refelctor now) B) no air is being pulled to the light now...

I agree with i believe it was sublimed... It works. If you havent tried it and your talking out your ass STFU... Obv others have tried it, sometimes it works, some times not... prob depends on fan, light wattage, size of room ect on if it will work or not...

blackcoupe01 said:

If this is your plan for your setup then dont bother spending the extra money on a cooltube, its only cool if you use it correctly. Buy a cheaper fixture to go with your cheap idea.

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Oh yea. and there isnt a cheaper reflector... $53 aint bad for a cooltube...

give it A try

Like I said before, it will work but near as well as having seperate vent systems for the light and grow room. Been there done that.

How big of fans do i need for a 400w then?

Arrid said:

erm mate

what the fuck..

your cooling of the light is seperate of the grow room.

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No way man.

I have my mine setup like this and it works great:

Carbon filter-> Inline Fan -> Dual Cool Tube (2 X 600w) ->
Dual Cool Tube (2 X 600w) -> Dual Cool Tube (2 X 600w) -> Exhaust

It works great, keeps the room temps good and the bulbs cool.

My cooltube is 600w, I have two 250cfm fans on it, one side blows and the other sucks for 500cfm worth of cooling, I can get my 600w bulb within inches of my plants without burning them. For a 400w light, just one 250cfm fan should do. Heres the ones I use, got three of em.

The 250 cfm rating on that fan from Home Depot it not an accurate rating. Compare the throughput of that with a 250 cfm rated inline fan from a grow shop, there will be a HUGE difference. It may blow 250 cfm with nothing at all connected too it but the second you attach ducting, filters, or anything else that number will decrease dramatically.

Those fans are BOOSTER fans. They are not made to work alone. The 250 rating is how much air will flow thru it before it (the fan) restricts flow in the duct your trying to boost the flow of. The FREE AIR CFM is the amount of air they move. For that fan it's about 160cfm. Also from my experince You will get better cooling from seperate systems. One for the light and one for the room. If you want to cool both with a single system you will need a much larger fan. also you want the coolest air possible for your cooltube using the air from the room might not be cool enough to really make total use of the cooltube itself. Thats what I think.