How much air needed

Any advice on how much air would be needed to cool down 8 x 1000 w xxxl magnum reflector`s , they come with 6" outlets , i think 8" would av been better, WHAT DO I KNOW, you might say, True as i am on here asking som1 else. , anyways any answers and id be grateful.

go with the 8". 6" could work but 8!" is def safer. make sure you have metal fans if you are going to pull and not push air so that you dont melt your fans!! 8000w outs out lots of heat.

personally i would probably use 2x 8" and place 4 lights on each one. i gues it depends on many factors..