On Wed, 24 Apr 2013 00:17:13 +0100, Major Scott wrote:

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.

Anyway, this is semantics. The point is you could get less flicker by having a higher duty cycle at a lower current, or by doubling the frequency of the pulses. Or just use a current limiter circuit and give it a constant current. Ok you might need better LEDs seen as they seem to be using crappy ones and making them appear brighter than they are by attempting to fool the eye and failing.

--
"I wonder who discovered we could get milk from cows and what the **** did he think he was doing?!" -- Billy Connolly