Hey thanks so much for your help. I don't have the box all done yet, it's just the frame but without ventilation or wiring holes cut into it yet. I'm currently just vegging in my room but it's time to finish this better setup. I'll snap a photo or two once I get it all set up. I'm thinking I'll have the fan blowing through a hole in the grow box so that it moves outside air around the canopy of the plant. Sounds like a good call to have one blowing stale air out as well, so I'll probably pick up another desk fan and set that up inside blowing out another vent hole. It sounds like the HPS would work with this weight-wise, I'm just wondering if it would be possible to have the plant canopy far enough away from the light in a four-foot high space. Assuming the plants grow to a solid three feet, that doesn't leave much room for the light to hang, right? Wouldn't wanna burn my precious plants! Thanks again, loafyboy!