inline 2 600w hps VENT cooling question

in my flowering room thats 2.6m x 1.2m i have 2 600w hps light in these homemade cooltubes,can i connect them through the same tube to a fan that takes 5 min to change the amount of air in the room,my question is this enough and will it release alot of heat if they go through the same vent,as the hot air will pass from the first through the other

per Al B Fuct, he talks about that going through 2 lights with 1 in line fan is fine (although he still recommends 1 fan 1 light if at all possible) But he does not recommend more than 2 lights per fan on cooling. Check the stickies out in the hydro section for details.