Not sure about the air flow, there aren't any fans I'm thinking the fins keep it cool.Where does the air flow in that ballast? You say it stays cool and im not doubting you..but I didn't see any fans...just curious
Apollo one for example has a tiny fan on each side for airflow
Got a Lumatek 1000W without fan. Apparently thats the better one. Its the only ballast ive had. It's obviously completely silent and operates at high temps. Best to go for quality in my opinion. Why risk it. Apparently Solis Teks are the best Lumatek second.lumatek 1000w digital dimmable. cool, lightweight, and supercharge mode.