On Thursday, 28 February 2019 14:36:59 UTC, Dave Plowman (News) wrote:
In article ,
NY wrote:
Given that LEDs are usually dimmed by altering the mark:space ratio of a
constant-frequency square wave, so the light is turned on for a
progressively shorter proportion of each cycler,

That€˜s not true of all dimmers.

Ah, do some of them simply reduce the current, as you would with
tungsten - though with more complicated electronics?

A normal tungsten dimmer works by altering the shape of the AC waveform -
so not so different to dimming an AC driven LED.

But LEDs aren't AC driven.