IMHO you could probably get away with an inexpensive twenty dollar Home Depot duct fan booster with those lights. You'll need to purchase a little duct work to help mount it. Probably under fifty bucks for sure. Put a small low power fan in the bottom to keep the air circulating and that's about as good as you can get under those conditions. If you want to reduce heat buildup pull the air out of the top and bring it in through the bottom.