Hydrogen 6 Inch Ice Box Water Cooled Heat Exchanger - Plantlighting Hydroponics

check these thing out. I run 8- 1000w hps all tied together with 2- 700 cfm fans and one of these in between every other light. I use a reservoir outside my room with a chiller. if you have water in your res 10 degrees cooler than your room temp you can completely eliminate your light heat....20 degrees cooler you actually start to cool your room off....little pricey, but cheaper than installing additional ac units to my location