Re: [Electronica] Led overdriving question
- I don't know the answer to your question, but I thought I'd throw this out
for your consideration.
You can get much of the brightness benefit of overdriving without reducing
the LED's life by driving it with a pulse train at a duty cycle proportional
to the degree of overdrive. E.g., if the device is rated for 20mA, then
drive it at 100mA with a 20% duty cycle. That's pretty easy to do with a
555 and a handful of other parts.
You get a greater perceived brightness than normal (this has something to do
with psycho-optics that I don't understand) and there's no danger to the
device. And as an added bonus, it's easy to adjust its brightness by
varying the duty cycle.
I too would be very interested in some real data regarding what you are
----- Original Message -----
From: "speed9500" <speed9500@...>
Sent: Tuesday, February 03, 2004 2:40 PM
Subject: [Electronica] Led overdriving question
> does anyone know of a chart that correlates led overdriving with burn
> out time?
> led's are rated at 100,000 hours. they suggest you run them at 20ma.
> if you run them at 40ma will they run 50,000 hours? 33,333 hours at
> I've run mine at 60ma and if they even run for 1000 hours I will be
> happy. any input?
> Translation, Web Design, Marketing & Advertising: MultiMedia Ltd,
> Yahoo! Groups Links
> To visit your group on the web, go to:
> To unsubscribe from this group, send an email to:
> Your use of Yahoo! Groups is subject to: