I am setting up a small flowering cabinet, 2x2x3.

I am planning on setting up a cool tube with a 400W HPS. I also have a 250MH that I was thinking of putting into a homemade cool tube made out of a Bake-a-round.

I plan to have a single 256 CFM squeril cage fan take air through a carbon filter and pushing it across the cool tube.

My question is would it be better to put both bulbs in the same cool tube, one at each end, or would it be better to have two cool tubes, with air ducting connecting the two, kinda of like an S. See pictures below.

I want to be able to run both bulbs in order to make the most of my crop.

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I would make a whole seperate tube, with it's own fan, filter and exhaust. I think that if you run both lights through one tube, you're going to run into heat problems (especially in a space that small).

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