Well, I would think about trying to use that 200 plus CFM fan to suck air out of the cool tube and I would think about putting it in a chain with the 80CFM fan, like keeping the 80 CFM where it is and then attach another vent to the output side of it and then put the 200 plus on it to pull, and have both working together, might work. On my set up I use two C24 cabinets put together which gives me a FT print of 38 inches d 47 W and about 60 high. I have an air cooled hood in there and have a 172 CFM Vortex fan pulling from the top of the hood out under the house into the filter and a 90CFM fart fan blowing in the side of the hood and this acts as my out take as well. On the bottom left corner I have another 90CFM fart fan bringing air and on the bottom left I have a 240 CFM Dayton bringing in cool air from outside. This keeps my box around 78D. I now have the 1K light in another room with another 1K with these parabolic hoods which are huge, 4 FT diameter, that are completely open and with one light going I can achieve the same results in the winter with the open bulb with no cool tube or aircooling or even a out take for that matter, but in the summer I will def have to reconfigure with an AC and possible air cooled hoods.
Now I have the 400W in the same cab with the 1K gone and I have taken out the 240 CFM fan and turned off the 90CFM fart fan that pushes into the hood so I only have a 90CFM fan on the bottom left and the 172 Vortex going and it is fine. I could put that hood with the 400w on my tummy and go to sleep I think it is so cool. Sometimes I can't even tell it is working right because it is so cool, but my plants assure me that it is with their growth.
Some key things for me have been a active intake that comes from the out side and the aircooled hood with the top vent to suck the heat right out of the top of the hood along with a good fan. The vortex 172CFM works twice as good as the Dayton 240 and that is a point to always consider, CFM's really are only as good as the brand of the fan IMO.
Hope this helps some, go a head and feel free to ask any more questions.
Adieu
BlueBear Reviewed by BlueBear on . Light intensity: Why to keep lights as close as possible Light intenstiy = Total Light Emitted / ((4 x pi) x (radius^2)) And light intensity decreases by 1/x^2 where x is the distance. So like if you have 135,000 lumens at 1 foot, you increase that to 2 ft, you it would be 135,000 x 1/2^2 which is 1/4 so basically one fourth of 135,000 = 33,750. Add one more foot, 135,000 x 1/3^2 = 135,000 x 1/9 = 15,000. Crazy huh? Thats why the top bud always is so big and the bottom ones are smaller, cause they get a lot less light. LST'ing takes that Rating: 5