Quote Originally Posted by Rockafeller85
When using one do you lose any lumens? and if so is it werth it to have one?
Not sure, but any loss would be greatly offset by the fact that you can keep your plants much closer to the light. Definitely worth it for me:thumbsup:

Is this fan 6 inch In-Line Fan 268 CFM EliteHydro.com larg enough for a 250 or 400 watt hps wit cool tube?
Yes that is plenty for a 400w, maybe even 600w(??).

I'm using a 129cfm 100cm inline fan for my 400w hps cooltube, and also as an exhaust connected to my carbon filter... No other exhaust or intake fans. But I have a very small space... That 268cfm fan might be enough for your whole space, depending on how large the area is. http://boards.cannabis.com/indoor-gr...ml#post1634834 That has a way to calculate how many cfm's you need and much more.

Slowly but sure i'm figuring everything out. thnx for all the help
Same here:jointsmile: