Could you scale up a lava lamp?

You don't. If it has leaked out or you were playing with it, oh well. Get a new one. Iirc the newer ones has a permanent bottlecap seal under the top lid. If its a vintage Lava Lamp, i suppose you could uncap a new one, while its hot, and decant it into the older glass model. read more

There is probably a correlation between the volume of the lamp, surface area of the base, and btus needed to effect the “lava”. Ive seen larger versions at spencers gifts at the mall, but they were maybe 40% larger. Ages ago, so i don't remember specifics. read more

On some lamp models, the cap is a simple screw cap that you can unscrew either by hand or by carefully gripping it with locking pliers. Other models, such as the Lava Lamp Grande, have crimped-on caps that can be removed by carefully prying around the perimeter of the cap with a small flat-head screwdriver inserted under the lip of the cap. read more