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Air resistance is to the cube or so of speed. Thus, buying a 400cfm fan and a fan controller that drops it down to 200 cfm is INFINITELY better from a loudness and efficiency standpoint. Like filters, it is almost impossible to go wrong by buying the biggest fan you possibly can and downgrading...

1. NEVER run a light without the exhaust running. (with the caveat of super-advanced and way-monitored systems using CO2 enrichment) 2. Input vents should be DOUBLE the size of exhaust vents. There ya go. At least 20% of everything you need to know about vents...

It's difficult to move air too fast, but it's easy to waste money on useless excess. 2-400CFM is plenty per kw. Your box size isn't terribly relevant. How many watts ya tossing into that little box?

Filters are simple. Get the biggest friggin filter you can physically fit into your space. Filters are priced based on total filtration capacity. Thus, doubling the filter size doubles the time your filter will work, so doubling the size costs you NOTHING. In exchange for those ZERO dollars...

fans and pumps are simple. Fans SUCK, pumps PUSH. So, you want as close to 100% of the air restriction for a fan to be BEFORE the fan. ANYTHING after the fan, including 20 foot of duct, is BAD. Where ever your system exhausts to the outside world, that's the BEST place to put your fan.

2x1000 = 2000. 2000 / 120 = 16.7. So you're within 3.3 amps of serious overload and you haven't even accounted for losses or fans or diddly squat. I'd say you're seriously overloading a circuit, and your power factor sucks as a result. Dangerous? Yep. Seriously inefficient? WAY yep.

To explain, Leaf has an efficient dark side (the top), and a lightly colored inefficient side (the bottom). By placing a vertical grow bulb in the middle/bottom half of a grow, you're gonna get bottom side lighting. That's inefficient. A vertical grow MUST have top side illumination.

Sounds like you're trying to use an extremely inefficient horizontal unit in an efficient vertical mode. That just doesn't work. Ya gots to build an efficient vertical unit based on physics. (Currently there are ZERO commercial options for such) I'd tell you how I do it, but then again I might...

Light is way too low (height). The glass et al reduces lumens, and the whole reflector thing is wrong. You've surely got no better than 70% efficiency. Not bad, but way way way not optimal. I do about 95%....

bde, the size of a filter does 2 things. Doubling the size of a filter will both double its life AND vastly reduce its airflow resistance. There's NEVER any reason to not buy the biggest filter you can (other than the REAL solution, which is to build one yourself and use raw charcoal to reload...

well, I suppose, but your light management seems weak. You actually have a FAN in direct line of sight of the bulb!!! NOT good. Light needs to go to leaves and ONLY leaves.

if i can provide MORE EFFICIENT and More Useable light in the end i win Ahh, but you can't. LEDs are less efficient than HPS. Smokey asked which is better: more light with an inferior spectrum (HPS) or less light with a better spectrum (LED).