mine usually stay around 110f. try to aim a fan at them to make them run cooler. best advice is to touch a strike anywhere match on it. if it lights it is too hot. a cooler ballast will provide more power to the bulb, and extend the life of a ballast.
well i have a lazer temp gun , 130 aint gonna lite a match. Im gonna aim fans at it like u say and see if that helps/
that is what i do. i keep my ballasts up near the concrete ceiling with a small fan on them. also they are placed by an opening that all of the air in my chamber is evacuated through to my veg room. i lazer temp all my ballasts every couple of days to make sure they stay cool. as with any electrical component, the cooler it runs, the better.