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should the fans on a ballast always be on?

so after a few years without growing ive decided to get back into it, bought a new bulb and fired up my 1000w dimmable lumatek ballast, set it at the lowest setting (600w) and noticed that the cooling fan/s aren't operating, its been so long since my last grow but i cant remember if they are always on or only come on when it reaches a certain temp?


anyone know?

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