LED Lighting?

["Tracey Gardner" <tracey.gardner@xxxxxxxxxxxx>]

A remark on LED lighting was made on another list that I am a member of.

The remark was as follows,

"One thinks of LEDs as being innocent DC devices fed via a resistor.
But
modern designs often turn them on and off at frequencies in the kHz range,
generating harmonics going into the lower radio bands"

I also imagined that LED lighting was purely DC driven and I'd be
interested
to know if this statement is correct?
If it is correct does anybody have any idea of the frequencies invloved?

Thanks

Tracey



------------------------------------