[CurlyDave]

The device actually works, but it only appears to be free electricity. I don't know whether an electrical engineer would call it a primitive antenna, or a primitive transformer, but it is picking up energy broadcast by the house wiring wherever it is located and using that energy to produce light.

While the light is on, the electric meter is running just a little bit faster and therefore you are actually paying for that light...

Now if you can receive energy from some else's electric source, and therefore their electric meter, you can get "free" energy, paid by them.

[Jonty30]

That makes sense.