1000w HPS/MH Lamp Cooling

So this might sound like a dumb question but it needs an answer!

I have a 1000w MH/HPS lamp with a cooltube reflector my question is to get the best cooling so I want to "push" air through the reflector or do I want to "pull" air through the reflector?

Basically I'm asking which way do I put the duct fan?

The fan should be pulling the air through. Pushing air through would def create more resistance.

i would put one pulling and one pushing,(so you got 1 fan on each ennd of the ducting)thats what i did!