Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!decwrl!labrea!rutgers!iuvax!silver!commgrp
From: commgrp@silver.bacs.indiana.edu
Newsgroups: sci.electronics
Subject: Re: speaking of LEDs
Message-ID: <7200014@silver>
Date: 29 Sep 88 23:04:00 GMT
References: <491@ole.UUCP>
Organization: Indiana University CSCI, Bloomington
Lines: 31
Nf-ID: #R:ole.UUCP:-49100:silver:7200014:000:1267
Nf-From: silver.bacs.indiana.edu!commgrp    Sep 29 18:04:00 1988




In article <491@ole.UUCP>, ray@ole.UUCP (Ray Berry) writes:
> This past weekend I saw a product that had a very bright red LED lamp
> in it... 3000 millicandellas at 20 ma. forward current.  Physically, 
> it was a T-1 package, nothing unusual. 
> Now that is a very high-output LED.  Does anyone know who makes such
> an item? ....

I read about "high-brightness" LEDs from Japan in Modern Electronics 
magazine a couple of years ago.  The author said that clusters of them 
would eventually replace incandescent bulbs for car tail-lights.  It 
was the April issue, so I didn't believe it!  :^)

The DIGI-KEY catalog has some 2000mcd LEDs for roughly $5.  I'm told 
that these are the same as Radio Sh*ck 276-087 LEDs, which cost less 
but are presently in short supply; your local RS may be able to 
special-order them. (These are not to be confused with RS' other "high 
brightness" LEDs, which are multiple chips in one package.)

Some cave-explorer friends are experimenting with the new LEDs for 
emergency light sources:  Two LEDs, each in series with a 33-ohm 
resistor, connected to two alkaline AA-cells, will make enough light 
to get out of the cave, for 24 hours.  Some cavers have clustered as 
many as 9 LEDs.

--

Frank
reid@gold.bacs.indiana.edu