"Tony Williams" wrote in message
...
In article ,
Andrew Gabriel wrote:

I've seen it stated on a number of occasions. I have not personally
tested it but it sounded plausable.

Early LEDs did have a light output that increased more than the
current increase, so it certainly made sense to operate LEDs in a
high current, low duty cycle pulsed mode. Modern LEDs are more
linear, so the only reason for pulsing would be to make the
brightness adjustable (or constant, as the battery goes down),
or maybe to resolve differences between the dc supply and the
LED's fwd voltage drop (but that would need an associated
inductor/transformer).

I'm really glad I asked this question.

I think.

Mary
--
Tony Williams.