??how to cool 12 1000watt lights???

ive been looking into kwikool and hydro innovations cooling systems i understand how btus work and how much i need i just want to know what system would be best for me i will be running 4 1000 watt radiants 8inch air cooled reflectors in three rooms should i have cooling in each room or have a system to cool all 12 lights what would work the best. anyone with tips on cooling that many lights please let me know

I cool 6 1000 Watt HPS Magnum 6" XXLs with a single HO 8" Inline fan.

All my ducting is metal 8", with reducers to 6" running to the lights themselves (6" lights)
I have 2 16 foot parallel straight runs for an intake/output - with 3 sets of 2 lights in between.
I ran slightly smaller lights than my main runs to help keep the velocity of the air flow higher.

You can accomplish the same thing by running 10" mains with a single 12" fan, and use 8" air
cooled lights. I'll upload a diagram of my setup here in a bit.

I have a 20x18 room with a 10,000 BTU A/C unit, and my daytime temps are only 4 degrees
above my night time avg. at 48% Relative Humidity.

thanks for the info im gonna try it out if it dont work back to the drawing board