From: "Boris Nogoodnik"
Subject: Re: What is maximum current for LED?
Organization: KGB, Ltd.
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Date: Wed, 2 Oct 2002 05:51:57 -0400
NNTP-Posting-Date: Wed, 02 Oct 2002 05:51:57 EDT
Interesting question. Specs give you constant current ratings that won't damage
them. Damage is caused mainly by overheating. However, there is one human
vision factor. If you use pulses instead of constant current, thy still will
look as bright as on constant current, but will dissipate much less power. So
here you can make them look much brighter by exceeding the maximum current in
pulses, but still keeping the average current well under the specs.
"Nelson Win" wrote in message
> 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.