Nahh mitch...for now its not air cooled...(still havent picked other fan yet) I too run my two 6" fans between the light and tops throughout grow.....I gotta get get that fan hooked up SOON...My pots ar 13'5" deep by the time the plants finish stretching it will be around 30" avg..., light is 7" tall, tent is 42" tall that leaves maybe 5" of wiggle room....sooooo my point is, with a fan attached to my 150 will that 5" from tops be cool??? <<pun intended...lol!
5in NOT COOL!
If you think those plants will get to tall just start bending them now! Super crop or LST them. Or you can bend them when they start to stretch, bend 1 time to make a U shape in the main stem. this will save you some space,, really dont think the PINKBUD will get too tall, but only time will tell.
without air cooled you need to keep the 150HPS around 1ft away no closer then 10 inches, 18 inches away on seedlings. Or you will burn the tops.,, you can try mount a fan blowing on the light but be carefull not to blow directly on the tops,, heat and wind damage can happen.
Hope that helps.
SGS