Comment by kuon

Balisor[1] usually uses capacitive coupling, but it require a long parallel cable.

Some lamps do use induction, like this one[2].

I guess it uses induction looking at the drone, it also works with an open coil.

[1]: https://en.wikipedia.org/wiki/Balisor

[2]: https://www.delta-box.com/en/marking/bht-marking-light-for-h...