3 cool tubes 2 fans

Hi all, I plan on setting up three 600w lights in three 6" cool tubes with two 435 cfm fans blowing on one side and sucking on the other. The setup will be in a straight line. I am concerned that the third light in the chain will be hotter creating uneven canopy temps. Any thoughts, suggestions about the setup?

Thank you
M

Can you run 8 inch ducting or cool tubes? Not sure if they make 8 inch or not but more air the better

Ive been poking around a bit and I think youre right, 8 inch is the way. thx anzo