I finally got a 400W HPS off of ebay, it looks like the douche bag who sold it to me stole it from a street lamp. anyway, the hood has a 1.25" - 1.5" round hole across from the tip of the bulb, it is perfect to install a fan or a tube leading to some sort of exhaust source. What type of fan can I use? Where can I find it? Also, can I use those MH conversion bulbs in the fixture without worry?