the base board conceals two ni-cad battery packs as used in RC cars cunningly disguised as batons of wood , wired in series these will cheerfully make a 12v bulb illuminate ... whatever its shape when connected via a couple of common carbon rods, clever bit of psychology as not many people know such a thing exists as a 12v Edison Screw rough service bulb, you see a big lightbulb and jump to the wrong conclusion assuming it to be a domestic mains variety. Even with higher res video I dare say it would still amaze many.
a quick trawl through the magic shops online also yields a trick lightbulb with internal batteries