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i have a 400w hps with 3 plants in a small ish wardrobe.have 1x 120mm PC fan suckin air in and 1x 120mm pc fan suckin air out .also in the ductin i have an 80mm pc fan suckin air out (dunno if this helps with the suction)
anyways .im in the uk an its winter so outside temps are low , but
those fans seem to do the job for me with my 400w hps .temps around 60-80 ish
http://boards.cannabis.com/showthread.php?t=46083
Me I had to go thru a lot of work to get my temps down for the 400w lighting system but I think it was worth it I have 4 big bushy females. I wouldnt regret getting it but I'm not going to lie it was a lot of work. 1 main reason it worked is cause the Cool Tube for the bulb. I still havent finished it but Its half done and its done half the job so if I just stop being lazy n finish it I'm pretty sure it will work 100%. for the cool tube check out the FAQs on Mellow Man or the IndoorCloset section on Turtle420 :thumbsup: