On Wed, 24 Apr 2013 00:09:36 +0100, Dave Plowman wrote:

In article ,
Major Scott wrote:
Take for example the brake/tail lights. These are often pulsed for
tail and on for brake. So what you said doesn't make sense.
Anything less than full voltage on (as for brake) will be lower heat.

LEDs are current, not voltage, driven.

When there's a series resistor, then you can think of them as voltage
driven.

Why would you have a 'series resistor' if they are pulse driven?

But in any case it is irrelevant. It's the current they are driven with
that matters - not the voltage.

One is related to the other. If you stick a million volts on the LED you'll get a huge amount of current and it'll blow up. If you stick 0.5 volts on it you'll get no current flowing.

--
"One dies in Istanbul suicide attack"