Cfm

what minimum cfm rating should i get in order to properly cool my lights.... i would like to use a cool tube....AT least 600watts


should i have a fan blowing on the light....or should i have a fan extracting and exhausting the heat?

Hi LoudBlunts - depending on the size of the duct work (4" or 6" i'm guessing) - whatever vortex style fan you get will suck the heat right out of it. which answers the second part of your question - suck the heat out rather than push the heat through.