It has to have the most common shape (at least here in Romania), that is the one in the picture below. It must look like a standard, not modified light bulb, as that's the whole point of the trick. The rig, though, it's separate (hidden on the sleeve or in a pocket). That's why I prefer a standard bulb with no modification, so that I can give it to the people to check it out.
Now, if this helps in any way, the presentation would be like this: the rig is hidden and masked wires go from it to the glove (simple leather glove). This way, when I hold the bulb in a certain position, the circuit will be closed and the condenser will release the energy, slightly lighting the bulb for a short period of time.