Wirelessly powering an LED strip

To be honest, I think you're better off to use a commerical Qi wireless transmitter and receiver, although depending on the distance and power, maybe it is a stretch as some will do quite a few watts, but not at any distance!

Doing something like you proposed is potentially very dangerous because what you're doing is essentially building an unregulated radio transmitter! If your signal is switched quickly (square waves) for efficiency, your 100kHz carrier will have (theoretically) infinite harmonics at every 100kHz (i.e. 200, 300, 400, etc.) but with somewhat decreasing power. This will cause interference to radio transmissions and potentially may generate stray electric fields that may cause equipment nearby to malfunction. Sure, a small coil at such low frequencies is not an efficient radiator and you're probably relying more on inductive coupling rather than on radiation, but the unintended effect can make your device very unwelcome especially in sensitive environments (e.g. labs) or if you cause disruption to legitimate services (e.g. aviation NDBs, long-wave, short-wave and medium-wave broadcast radio).

- Gough

To be honest, I think you're better off to use a commerical Qi wireless transmitter and receiver, although depending on the distance and power, maybe it is a stretch as some will do quite a few watts, but not at any distance!

Doing something like you proposed is potentially very dangerous because what you're doing is essentially building an unregulated radio transmitter! If your signal is switched quickly (square waves) for efficiency, your 100kHz carrier will have (theoretically) infinite harmonics at every 100kHz (i.e. 200, 300, 400, etc.) but with somewhat decreasing power. This will cause interference to radio transmissions and potentially may generate stray electric fields that may cause equipment nearby to malfunction. Sure, a small coil at such low frequencies is not an efficient radiator and you're probably relying more on inductive coupling rather than on radiation, but the unintended effect can make your device very unwelcome especially in sensitive environments (e.g. labs) or if you cause disruption to legitimate services (e.g. aviation NDBs, long-wave, short-wave and medium-wave broadcast radio).

- Gough