From: John Woodgate
Subject: Re: What is maximum current for LED?
Date: Wed, 2 Oct 2002 13:35:26 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 2 Oct 2002 15:19:56 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Nelson Win
wrote (in ) about 'What is maximum current for LED?', on Wed, 2 Oct
>I bought a few high brightness 3mm LEDs (various colors: R,G,B,W) and
>the specs mention a forward current (If) of 20mA and peak current (If
>(peak)) of 100mA (160mA for red). The specs don't say anything about
>the current beyond that, nor what the recommended maximum current
>should be. There's not even a brand name on the LEDs so I can
>approach the manufacturer. I want to squeeze the brightest light I
>can from the LEDs without prematurely burning them out. Does anyone
>have any experience here to recommend a maximum current? The LEDs will
>flash on and off at a frequency of a few hertz, 50% DC, for a duration
>of a couple or hours at a time. Any advice appreciated.
Beyond 20 mA continuous you won't get significantly more light. But at
50 % duty-cycle, you need to go to 40 mA to produce the same visible AND
(more important) no excessive heating effect.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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