Wow Illusion.
The 8"maxfan will cool your light no problem, as a matter of fact, you might glue your bulb in so it don't get sucked out! That 8 " max fan will cool 4-6 1000w lights with no issues, so cooling one light will be no issue.
I use a 10' max fan for exhaust (hooked to a carbon filter), with a passive intake (about 7"). And this is a 1000 cubic foot room. I can BARELY close the door as it is. I ended up getting a speed controller to slow the 10" down.
I think if you have 2 8" for intake/exhaust, it is WAY overkill and it will be like Katrina in your grow room.
Really, for the size of the room you have, you can take that one 8"maxfan and have it PULL thru your lights and be used for room exhaust.
Have the fan pulling from one end of the light, and the other end of the light, duct it to your carbon filter. So it pulls air out of your room, thru the lights, and exhaust out of the room.
I pretty much have allways used Can Fans.4-12" Then I bought thier Can Max Fans. BIG difference. I will allways buy the Max Fans from now on.