Easy: I can't stack them--not enough room. A picture (or two or three) is worth a thousand words:
This last one shows you the exact clearance I have. I am hoping to put a tub on top of the T8 to hold my super (maybe?) pastel that I picked up last week:
I'm not sure where else I could put a T8 other than, perhaps, in front of the fireplace (which we never use) on a stand. However, I don't think my wife would agree to that.![]()