On Saturday, October 17, 2020 at 10:25:15 AM UTC-7, wrote:
On Sat, 17 Oct 2020 01:58:55 -0700 (PDT), whit3rd
wrote:

But fluorescents with an electronic ballast don't have 120 Hz or 60 Hz modulation (flicker).
If you work with moving machinery, that's an important advantage.

LEDs are no different.

False. A 4 kHz AC ballast for fluorescent tubes sustains a plasma that gives off light
continually, but the same with LEDs doesn't get the same effect, because LED turns
dark in a microsecond, but fluorescent turns dark in a millisecond.

The 'regular-ballast' and direct to AC wire LED variants go dark 120 times per second.
SOME, not all, LED light supplies give filtered and regulated DC current, but the
sales literature doesn't tell you about that.

You can see odd strobing effects on some video recordings, if the light flickers, and it can
kill remote controls or make my machine tools seem stationary when in full powered motion.