How to vent a T5? Heat issues.

So here's my issue: I've got my 4' 6 lamp T5 in a 22"x75" closet. Right now I've got an oscillating fan used for air circulation and then a three speed floor fan that sits at the corner of the closet (the entrance of the closet is a 5'x7' opening with poly-film on 3 corners and the bottom-right flap opened with the fan there). I've got my one plant about 5" from the lamp with my thermometer right next to it. Before I put in the second floor fan, my temps ran in the high 80's (lights on) and now with the second exhaust floor fan I've got the temps down to low 80's, but I am trying to get to that magic area of the mid 70's. The only problem, I feel, is my light. There are no good venting solutions for directly pulling the heat from the perimeter of the lamp itself (like there is the Cooltubes for HID lamps). So my question is: How do I get these god damn temperatures down?

Is there a product out there for T5's? Should I get an exhaust fan and put the intake duct next to the lamp? Or should I put it higher up (as heat rises)?

Distance from plant to lamp.

Circulation fan.

Closet from outside.

try to face the fan directly at the bulbs of the light....it will then move air and keep the light cooler (hopefully) and grow a couple more plants...i hate seeing all the efforts being put into only 1 plant

CrazyBudz said:

try to face the fan directly at the bulbs of the light....it will then move air and keep the light cooler (hopefully) and grow a couple more plants...i hate seeing all the efforts being put into only 1 plant

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Thanks for the input. I have more beans in the mail; Nirvana is just taking forever to get them to me (Note to Self: Use Attitude next time.) And the small 6" clip-on fan is pointing directly at the light (this may not be enough), I just used an old picture I had from a couple days ago.

Add exhaust fans, drawing hot air from the top of your closet.

dude i have a 8 lamp t5 that doesnt get that hot.. fans brother.. one occilating in room and an exhaust and intake.. start with the circulating if there is budget issues.. strike that man if your in a sealed closet you need to get that heat out of there...

reggaerican said:

dude i have a 8 lamp t5 that doesnt get that hot.. fans brother.. one occilating in room and an exhaust and intake.. start with the circulating if there is budget issues.. strike that man if your in a sealed closet you need to get that heat out of there...

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Now comes the cfm question: How many cfm's for my closet? It's an odd shape, and I'm having trouble calculating volume of it. It's 8' tall and this size:

^It's about 100 cubic feet, give or take 10.

Thank you. When I did the math, I somehow came up with over 2000 cubic feet, figured I was too high, and put down the calculator for the night.

Auzzie07 said:

Now comes the cfm question: How many cfm's for my closet? It's an odd shape, and I'm having trouble calculating volume of it. It's 8' tall and this size:

View attachment 1188848

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haha sounds like a trick ? but that is right around 100 cubic ft + or - bad math the first time right jaw

So would something like this be enough to take the hot air out of my closet?
http://htgsupply.com/viewproduct.asp?productID=46434

Everyone that reviews this product on here says it's not worth its weight in bud, so I'm not sure.

Depending on how far your venting it to ...Yes

Go with their 6" model, it's only $10 more, and twice the CFM. As long as you're just using it to move air, they work great. Where they fail, is trying to pull air through carbon filters. They don't have the 'umph' for that. 'Free flowing' they do pretty good.

Right now, smell is not an issue, so I'd say I would be moving it just to move air, and Wouldn't be moving it through more than 6 feet.

^It'll work perfectly.

Mate get a el cheapo case fan any size you probably have a spare one lying around if not your local computer shop will, wire it up to a power pack for something like modem or something it works a treat I have 2 fans running off an old modem power pack and they keep my stuff nice and cool.

Chunky said:

Mate get a el cheapo case fan any size you probably have a spare one lying around if not your local computer shop will, wire it up to a power pack for something like modem or something it works a treat I have 2 fans running off an old modem power pack and they keep my stuff nice and cool.

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Those fans aren't going to do shit for a 100 sq ft closet. A grow box? yes, a closet? no...

I use the fan below to vent from my closet into my master bathroom, then outside. Perfect for no attic space.

the problem you are going to have even if you vent the space is that the air that replaces the heat in the closet as some heat in it. say for example the air in your house is 75 degrees. that means that under your light the air will NEVER get below 75 degrees, it can only be higher because there is a heat source right over it. the best you can do is come up with a series of about 3 small fans to blow the air over your light and blow it out of your closet. you're never going to "cool" the air below the temps in your house with any fan. you would need an a/c for that, and since you are using t5s i think that might be overkill. i have never had heat issues with my t5s except for on warmer summer days, but i did have a small fan and its only purpose was to act as an exhaust. it just sat on my plant shelf pointing toward the door that i opened a crack. a big fan pushed the heat and air towrd this fan, and this fan pushed it out the door. i'll put up pics if i find them. dilluting the heat should be enough with t5.

Auzzie07 said:

So would something like this be enough to take the hot air out of my closet?
http://htgsupply.com/viewproduct.asp?productID=46434

Everyone that reviews this product on here says it's not worth its weight in bud, so I'm not sure.

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dude i used those in the past and they would work great for a closet.. super quiet also