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My LED bike headlight interferes with my wireless speedometer/odometer when it's in power-saving mode.

If the headlight is on full there's no problem. But if it's on one of the dimmer power-saving settings my speedo goes crazy. First it read 48mph, then 2mph, then 0mph, then back up to the 30s.

The light doesn't actually dim when it's in power-saving mode, it actually flicks on and off faster than the human eye can perceive. I don't know the exact hertz but it's faster than the human eye, but slow enough that it's visible on an iPhone in slo-mo mode.

Anyway, that flicking on and off generates enough RF buzz to mess things up.



Is it similar with these boat LEDs? Is it the power supply switching that's causing the interference?
 
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