"Black Iccy" wrote in message
...
On Fri, 6 Sep 2013 01:31:39 +0100, "Arfa Daily"
wrote:

That aspect can be mitigated by
having a conventional diode in inverse parallel, but this will result in a
flicker at half the supply frequency that Phil can't see, but some of us
can, or by putting another LED in inverse parallel, which will conduct on
the opposite half cycle producing light, and clamping the reverse voltage
across the first diode to the value of the forward voltage of the second
diode, different, of course for different colours.

Surely, it will be at the _SAME_ frequency but exist as a light
source for only half the period (duty cycle). N'est-ce pas?


Each LED will flicker at half the supply frequency, but each will emit light
on opposite halves of the AC waveform. Thus, if the two LEDs are physically
close together, the flicker from each will be mitigated by the other.

Arfa