Thanks, will start looking for another ballast housing and try that , but i tried putting the heat sync of a processor on top of the ballast, then made a frame from a hard drive housing on an old computer to position the fan an inch and a half over the top of the ballast and heat sync and within 25 mins the ballast has cooled to 27c, oh and the ballast itself is mounted on top of the grow box on a ceramic plate at the min, as i am waiting for my fireproof boards to come, thanks again for the quick reply
mat