Thanks for the reply Blue Bear!

I just ordered the light and it isn't here yet. I was under the assumption that the air-cooled tube wouldn't be open to the box at all, thus keeping it cool in the box.

The picture looked there was ducting coming from both sides to make a U pattern. There would be an intake hole on one side of the box and an outake hole on the other side (both holes on top of box). One whole would suck fresh air from the outside across the bulb and be pushed out the other hole with the hot air created by the bulb. There wouldn't be any smell this way, as it's all self-contained fresh air not exposed to the plants.

If one end is open to the growbox, then what do I do about smell protection? Can I put a carbon filter over the opening in the grow box or behind the squirell fan?

I was under the assumption that I could just attach a DIY carbon filter to a 100 cfm fan and have another small fan on the tops blowing air toward the carbon scrubber.

The intake would just be passive with 2-3 four inch darken holes on the bottom side opposite the other side where the outake fan are to get circulation from the roots on up.

Sorry for the novel, but what does everyone think about this?

--manowar