Some air cooled systems dont really have a good seal at the seams. I tape all my seams on the hood and insure the air flowing through your light comes from an out side cooler source - not your warm grow room. Make it a closed system if it's not already. Also, if possible increase the amount of clean air flowing into the area generally. A bigger intake fan may be? Although an air conditioner would be your best bet in a really warm grow room, smaller set ups can easily get away with proper ventilation. Rooms can be a little warmer if there's allot of air flow. I also run everything at night sucking cooler outdoor air into my room. Good luck and let us know how things go.