Hey Rich, I would love to use a sealed reflector but can't fit one in and $$ is also a problem. The main problem is that my depth is only 12". I could fit a 6" cooltube but wouldnt be able to vent the hot air out of the top of my cab(not enought room to bend 6" tubing up. I thought with the glass it would seal the light in its own little room and be easier to vent up. The space would act like a vented reflector. The space is about 1 cubic foot so a 25 cfm fan would refresh the space 25 times in 1 minute. As for the mother/clone room I was hoping I could fit it in but this plan isnt set in stone. What lights do you use in your lower chamber? I was thinking of using it for a Bonsai mother less than 1ft total height, maybe some clones down the road.