How to cool a 400w hps non air cooled fixture ? (Wing reflector)

I have a 40x40x78 tent and wanted to use my wing style reflector but have never cooled a non air cooled hood. How would i place the duct work ? I'm looking at a 4" inline fan 180cfm and 10-16ft of ducting.

Got a cooltube around the bulb(if you did you probably wouldn't be asking this question to begin wtih)? If not...there really isn't a way to "cool" the bulb with a reflector like that + inline fan + ducting...stick a fan on the side of the tent pointed up at the bulb?

if you used a 400 watt c.m.h bulb, you would have a lot less heat and a better bulb. a simple walll mount fan would cool it.

yeah no tube just a batwing style reflector -so I really don't need to exhaust it out the top of the tent but can just put a fan next to the fixture ?