The kicker is, this isn’t even necessary. It’s not LED lights that are the issue, it’s poorly-implemented dimming of LED lights.

In some cases (home lighting dimming), you can either buy a dimmable LED light or buy a dimmer made for LEDs.

But sometimes, it’s just built in to the device, and there’s nothing you can do about it. All it technically takes is a really simple circuit that adds capacitance to the line.

If toy have a cheap strip of LEDs dimmed by a cheap PWM controller, you might even be able to just take the positive and wrap it through and around a ring magnet multiple times. I’m not sure that would work, but I’ve seen it done before for noise filtering, which this is, effectively.

What that does is averages out the highs and lows, significantly reducing flicker. There are some devices out there that do the (small amount) of work that is required not to flicker. It’s just… …dimming by flicker is really easy, and if a manufacturer can save a few cents at the cost of quality, a lot of them will.