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.
Atkeni Reviewed by Atkeni on . 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 Rating: 5