1. Whatever is safest and easiest to work around. You don't want shit hanging all over the place. I would think that putting the fan before the heat source would perhaps make the fan last longer, but if using a fan rated for the heat it doesn't matter. Why not one on each end, lol?

2. There are planty of things to worry about with growing cannabis...a few lost lumens from an HID throwing-out over 50,000 of 'em isn't tops among the important issues. After all...it is a Sun System to begin with. (cheap and effective, but not the industries' finest)

Use the safety glass, or wear UV sunglasses and long sleeved shirts. (limit exposure)

I used to use my 400w MH in my 4 x 2 x 7' tall closet with no issues, once you figure-out ventilation and light leaks.
Rusty Trichome Reviewed by Rusty Trichome on . Sun system Ac hoods 1).Okay I have a question does it matter which end you are pulling the air from the hood from.? Like from the bulb end or the socket end.? 2). Does any one think that they lose light using theses hoods, Just dont look like the ends where your ducting gets attached to, seems like it don't light up theses sides of the cab that well.. Maybe it is just me be over cautious. Juust kinda looking for some thoughts from experiences or maybe info. u have Cab. is 2x4x4 hood measures Rating: 5