If you look at my Jedi thread you can see the space I grow, it is 23.5" x 23.5" around 5.5' tall. To be fair the fan/variac and muffler all sit outside of the grow box, with a small grow room and 400W light I needed a lot of air circulation for temp control. Even when running my 90W UFO and a couple 43W CFLs I need the airflow in there. Is it overkill, maybe
But it works and the sound is low enough it can be masked with a window fan or PC.
I am ordering 400w dimmable from ebay in few hours, but I have 150w htg and 135w ufo in small grow room at the moment; 5,000 btu window a/c can keep temps at 60 if i wanted during summer, doesnt go much above 80 until august, and its for like 2 weeks if that, short summers here. You think I would need cooltube for the 400w or just ac controlling room temp is good enough? I figured from rough estimates the 150w is 340 btu of heat, so i would be looking at lil over 1,000 btu with all the lights going, I'm thinking the a/c being rated to cool/ventilate 5x that space should be good enough? My temps are easily controlled by how low/high the ac is set.
It's quite a small room and the intake air is not far from grow spot, temps directly fluctuate when a/c clicks on, so it keeps them well regulated within 75-80 degrees on average setting to keep room cool, the a/c also pulls air out but I figured I would invest in lights before a tent so I don't really have any exhaust, the room is the tent atm, but she stays well vented and humidity/temp is controlled easily. Was a little nervous but it is dimmable so I figured I could work around if I do have any problems hopefully.
edit: checked ur thread, ur lights are pretty close, closer then my 150w hps and 135w ufo lol, think I'll try to find one with a cooltube just to be on safe side.
Also, don't be like this guy:
[video=youtube;pXZd8wRvD_M]http://www.youtube.com/watch?v=pXZd8wRvD_M[/video]
lolll