about ventilation..

Am currentyly designing my set up and have a question about the ventilation. We are planning on having ducting running through all of the reflectors to cool the bulbs. How do most people go about doing this? Could I pull enough air through the lamps to cool off the entire room as long as I have a good intake as well? We are planning on having around 8000W of bulbs. Just wasnt sure If I should have an additional exhaust fan along with the fans that are pulling air thorugh all the lights because It might slow down the intake too much? I know some people keep the air that cools the lights from ever touching the smelly air down below-What are some advantages of not doing it this way? I\'m not sure having that many places to exhaust air is going to be very do able for me. Sorry if this question is confusing..
 
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