I used to run a 6" cooltube, yes it was great at taking away the heat. But it had some down sides. Cooltubes create hot spots and dont really spread the light. They are great at focusing in 1 area but if you have 9 pots in 3x3 grid only the middle one will get the punch.

Just get a nice sealed reflector with 6" air flanges to spread that light some more. Even better if it comes with a diffuser directly behind the bulb against the reflector.

:hippy: