In article ,
Ian Jackson wrote:
Nothing is really only 'current driven'. It's more correct to say that
LEDs need to be driven from a power source which provides a fairly
well-defined current.

Very well defined if you're driving them hard. The source voltage is
irrelevant. Provided it is more than the forward voltage drop of the LED
or LED chain.


Even when you drive them with pulsed current, the
amplitude of the pulses will be determined by the voltage producing the
pulses. At any instant, the power dissipated in the LED is simply the
product of the voltage across it (typically 2V, depending on the colour)
and the current flowing through it. When pulsed, the average power is
also determined by the mark-space ratio of the pulses.

As I said, it's the current flow through the LED that you design for.

--
*Why do overlook and oversee mean opposite things?

Dave Plowman London SW 12