hi. i run 4 600's in aircooled reflectors in a 6.4'x6.4' tent. they are arranged in a 2x2 pattern. i run outside air thru the lights and back out, with a 6" 452 cfm vortex on each side doing push/pull (this helps maintain static pressure through the airpath.)
now, with a 4'x8'... i would...