dogberry: True, just like hot air ballons which use heated "normal air: for lift, that could be done. However, the sphere would have to be too big...for the larger model, it states:
"Fills with 148 cubic feet of helium in approximately 20 minutes."
If it takes 63 cu.ft. of 200deg air to lift a pound, this 148 cu.ft. globe would only be able to lift about 2 pounds...im sure the light setup weighs 8 pounds or more...necessitating a much larger globe, at which point it becomes too large and ungainly for its home use purposes...a 6 foot globe is much more "practical"...
So,,,who is gonna go out and make one of these translucent beauties!! It'd be just the thing for those christmas parties!