Computer fan lower heat stress

So i figured the tops of my plants where gettin way to much heat stress from the HPS lamp giving them life and i cant move them any lower or the light any higher so i figured i gotta extra computer fan and a 9Volt Battery, why not make a little exhaust fan to lower the heat stress. So i strapped a battery to the side of the fan, connected the wires and have it hanging right next the the lamp right between the tops of the plant and the lamp bulb. Its not super strong obviously but any help for free is worth it...ill post pictures in a little bit so you guys can throw some feedback. Id much rather have a power source from the outlet to power it, but im not tryin to mess around with wiring using currents from the house lol, i dont know how to get into the converting currents n such and the battery works. Any guess on how long a 9Volt batt. would last powering a tiny 12V computer fan?

Not long.
You can get small A/C desk fans at walmart for $5...

not right now there "out of season" thats what they told me i want to get a couple of them

Well then any idea on how to use my outlet to power the fan? Like im sure i can just wire the + and - wires to a power cord and put it in, but any idea on a way i can do that

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Originally Posted by SunnySativa

im sure i can just wire the + and - wires to a power cord and put it in,

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If you are trying to start a fire!:what::what:

I cheated a bit, and used a spare powersupply, plugged it into a motherboard, turned the pc on, then unplugged the motherboard, leaving the fans in. PSU is still running, as are the fans connected to it. made it nice and easy, as i can add/remove fans with ease.

the PSU adds a bit of extra heat, but i have it exausting out the case with anouther 12cm fan- its 69% efficient and the fans are only a few watts each.

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Originally Posted by psteve

If you are trying to start a fire!:what::what:

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Lol yea i figured

Also, i do have a power supply i took out of the computer but in order for the fan to work it has to be plug into the motherboard right? Thats a little more effort then its worth, i mean i could just put one of those desk fans in there like blowing against the wall so its not blowing directly on the plant tops, might be a little to much air.....i can make a switch ez for this computer fan, just wish i could figure out a way for my light timer to some how close/open that switch and that would solve the problem, but how lol

go to radio shack they have computer fans and power supplies for them i can actually give u the stock numbers they use

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Originally Posted by SunnySativa

Lol yea i figured

Also, i do have a power supply i took out of the computer but in order for the fan to work it has to be plug into the motherboard right? Thats a little more effort then its worth, i mean i could just put one of those desk fans in there like blowing against the wall so its not blowing directly on the plant tops, might be a little to much air.....i can make a switch ez for this computer fan, just wish i could figure out a way for my light timer to some how close/open that switch and that would solve the problem, but how lol

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I did somthing like* shorting out the green and black terminals on the PSU mobo plug with a paperclip, or somthing

*I cant actually remember right now, i upgraded to some AC fans from Do it all today

Heres the fan i speak of, and thats where i was plaining on placing it....just to give you a visual