My idea of a DIY heat exchanger for your lights...

this is one of the best water cool systems Ive ever seen but I've figured out a way to make it cheaper!!! here is the store bought one you can get....

http://www.growlightexpress.com/water-cooled-lights-8/ice-box-heat-exchanger-6-inch-306.html well I found out a way to make it our selfs way cheaper...

buy this for 20 bucks (actually just find a heater core from a car that fits your size adapter and price)

http://www.google.com/products/catalog?q=heater+core&hl=en&biw=1109&bih=627&prmd=ivs&um=1&ie=UTF-8&cid=1565238158035838194&ei=ipIKTdCMKoaisQOH2_W9Cg&sa=X&oi=product_catalog_result&ct=result&resnum=5&ved=0CGcQ8wIwBA#

and then one pair of these

http://www.comfortgurus.com/product_info.php/products_id/955

or

http://www.comfortgurus.com/product_info.php/products_id/957

total about 30-40 dollars now just some fitment issues and some sheet metal screws and your done...I will post my end results once these items are delivered but it should work just fine......

Sweet shit man. Im getting ready to setup a 400w hps system and want to vent the air into a clone chamber of the box but the air is too hot. This may be the solution I really want. Rep!

love it awsome work man

Does anyone know how this ended or have a good reference of similar?

I'm looking to do something similar to try cool ambient temp air in my room using water about 18C celcius. I may be able to get colder water by leaving the cooling Res outside suring these cold months. (often freezes!)