I'd get two 600-watt lights for flowering, and build a medium-sized cabinet to hold your mothers and clones and put that near the doorway so it's easy to get to. You'd have to restrict your access to your veg stuff to the day part of the flowering cycle that way, so as not to freak out your flowering plants.

A 4" fan won't be enough. I don't think a 6" fan would be enough either. That's almost 400 cubic feet. I'd get at least an 8" fan, and a beefy carbon filter to match.

I use a 400-watt HPS in an area that's 20" deep by 46" wide -- not quite 2' x 4' in other words, and it's barely enough. Not much canopy penetration, especially at the edges of the 46" width (so I supplement with some CFLs at the edges). I guess it depends on how much of that space you want to devote to flowering. If you use a significant amount of that square footage, you will need much more than a 400-watt light.
jamstigator Reviewed by jamstigator on . 8 x 6 x 8 room setup help please Hello was wanting some insight from some more experienced individuals about starting a grow room. The room is 8ft long x 6ft wide x 8ft high. I have some supplies 400 watt hps for budding and wanna use fluoroescents for cloning and veg. I have 4 48 inch cool whites for cloning and a set of 4 48 inch full spectrum bulbs for veg. I have a cloning machine as well. I also have an ozone genorator to combat smell and 4 inch vortex fan + hose running to chimney to be blasted out roof. Id like to grow Rating: 5