OK what do they use then, All I remember from my brief experience trying to
dim leds was that the most successful way of doing that was by duty cycle,
ie on to off times with them driven by some kind of oscillator with variable
mark space ratios. However it is obvious that even the briefest of ons and
the longest offs tends to still be visible in most cases, and not terribly
accurate if many leds are used as the load, there being a spread of
linearity in any given number.
Brian

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The Sofa of Brian Gaff...

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"Rod Speed" wrote in message
...
Brian Gaff (Sofa) wrote

Never saw the original post.

He ****ed up uk.d-I-y he had uk.diy

There is a holding current in a triac, and once the current drops below
this a kind of Hysteresis occurs so you need to turn it up to get it
conducting again.

leds don’t dim using triacs but still cant be dimmed right down close
to zero for use as a nightlight with the philips hues particularly.

Rod Speed wrote
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.