Most valuble post!

[jjsunderground]

check this out... a light cover that eliminates 93% of heat from a 1000 watt lamp. probably 100 of a 600 wat. its water cooled. peace!
cgi.ebay.com/Water-Cooled-Grow-Light_W0QQitemZ220183162964QQihZ012QQcategoryZ42225QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[jjsunderground]

you could probably use a five gallon bucket resevoir if you used dry ice to help cool. as a 55 gallon drum may require more space and the larger quantity of water stays cooler than 5 gallons.