My light bulbs are encased in a metal hood with a 6" duct collar on either side to push or pull hot air out of the bulb area effectively extending bulb life and removing hot air and hot spots (from the high wattage bulb) under the light. With enough air going through them they will be the same temp as the room almost. I used them to get them closer to my plants without burning them. ( I grew tomato's indoors with them
If you don't get me quite yet I can get some pics up. Or just look up air cooled HPS lamps