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try to put one of these in your grow tent, of course if it's big enough to fit it. http://www.lowes.com/lowes/lkn?action=productDetail&productId=95021-1621-3733&lpage=none my local lowes has it for $14.50. You need to be careful and make it blow to the wall, not to the plants, keep it on low...

or you can use an old computer PSU (the power unit inside the pc), you can short two wires on the big plug that goes to the motherboard, and it'll be alway on. http://www.gideontech.com/content/articles/196/1 that was the firth thing that came on google. They put an on/off switch, not really...