Intake/Exhaust question/advise expert needed

Sup Sup Sup guys

Im building a new room and ran into a little problem

So im running 3 6inch aircool tubes 600w(red) (for now ), Exhaust outside 6inch, 8inch inline fan 700+ cfm (green), problem is my a/c exhaust (yellow) is fuckin hot so i wanna exhaust it with my 700cfm. Soooo Ive been experimenting and having a problem with BACK DRAFT so it seems like the only way i can do this is Y it with this piece in this exact direction.



So what is everyone experience:
how much cfm do u need to exuast 3 cool tubes?
will my cfm be cut in half for the lights or will this set up get me like 60/40%?
any other options?

My room is 8 feet by 15, my ac has about a 200 cfm moter built in, cutting another exhaust hole is not an option

Fans suck harder than they blow, but why don't you put the fan in front of the lights and let the ac blow its air through the y by itself. The fan will still be sucking due to the ducting you have going down but will be blowing through the lights. That's how I have my fan, its only 400 cfm and cools my 2 400 watters pretty well.

When i put the Y on the blower side it was causeing back pressure and blowing down the ac.

Im going to experment suck from the lights and the a/c spliting the cfm,

Any one ever hook up a fan to there a/c exhaust?

bumpskis/....................

If you put your fan before lights does it work well besides the backpressure on the ac? Cuz you can put a damper on the ac side of the y that will stay shut until the ac turns on

hmmmmm, ill give it a try but that could work

Im running a similar setup. 14000 btu ac unit exhausting into the light pipe ducting. After much testing... I found it best to run the ac exhaust into a Y pipe on the INTAKE side of the Light cooling fan. Yes seems like it would heat up
your lights more. But there was only a 7F temp rise in the air exhaust. On the Y pipe intake I placed a damper to adjust the flow from the ac unit.
I have insulation wrap on all my ducting as well...