Then definitely look into cooling ducts and fans one for exhaust and one for intake, people prefer carbon filters in there exhausts because when your plant starts producing buds it will eliminate the smell More TLC = More THC
Changing your light to fluros or CFLs can help drop the temp, fluros more than CFLs, in CFLs the heat is in the ballast not the bulb. T5s are the best they say, but for you HIDs are not the way to go, unless you find a way to keep the box cool More TLC = More THC
If its eBay make sure its a reputable source not just some random seller. But eBay has better deals than amazon. By all means, shop around online you might find some good deals More TLC = More THC
get some cfls at least one a plant. will run way less heat than what you got. next install your fan facing outwards through a hole at the top on a side wall. maybe get another fan for that and just keep the fan you have where its at. thatll solve your temp problem. as for humidity just spray some water around everything lightly inside and itll raise.
Update. Haven't gotten the cfls yet. Tomorrow I will. The new light sucks. Sent from my iPhone using Grasscity Forum