| my fans are temp senstive there 12v but they run all the time there is voltage...
so when the MH turns on the fans do too and the fans speed up as the light gets hot so it keeps the temp under the canopy cool. but they do not turn off when the temp is cool enough....
i have a 12v ac dc converter from radio shack 8.99? hard wired to my timer with the mh ballast if you really wanted it to turn off i think you could wire in a old style coil home thermastate to make the fans turn on and off.
but what i am planning to do next time cause i am building a 75 with the2 250's is to run the temp sensitive fans but ones that are less noisy than mine becouse i have done some experimenting with differnet brands of 80mm fans and they are not all the same for cubic feet per minute or noise DB levels
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