In wall air intake

Hey guys, so im finishing up my bloom room. I have to build a 8x8 wall to close in the bloom room. Im wondering if put a vent at the top of the wall on the outside and a vent at the bottom of the inside will that be far enough apart to be light tight? 7 ft high wall.

Thinking of using 2 of these
http://www.amazon.com/dp/B0134AGZCY/ref=twister_B0134AG0RO?_encoding=UTF8&psc=1

Room is 8x7x7 and im running a 8" fan.

Should be plenty of space, use 90s coming out of the wall opposing each other and you will be fine..

Or those grills work.. Have the vents pointing towards the ceiling.. Then the ground in the bloom