On Monday, October 19, 2020 at 7:20:24 PM UTC-7, wrote:
On Mon, 19 Oct 2020 17:38:37 -0700 (PDT), whit3rd
wrote:


... the plasma lifetime in fluorescent tubes is known, and their ballasts always deliver AC instead
of DC because of filament sputter erosion. The AC will make LEDs go dark at zero crossings,
because those LED filled tubes (I've dissected some) have only diodes, no energy storage.

Maybe the cheap crap but it's not all cheap Chinese crap. There are
such things as switching power supplies. No zero crossing - current
controlled (i.e. a ballast).

Yes, there ARE such things. Good luck finding them when the consumer literature
describes the fixture without reference to them. This is one investigation...
https://youtu.be/BTq33MiVAsI