[time-nuts] LED reliability

Stanley Reynolds stanley_reynolds at yahoo.com
Wed Apr 30 13:47:08 EDT 2008

Quality and design still play a large factor as I replaced several 12V RV bulbs with new White High-Intensity LEDs and they all failed within the first 60 days.

----- Original Message ----
From: Poul-Henning Kamp <phk at phk.freebsd.dk>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Wednesday, April 30, 2008 12:12:56 PM
Subject: Re: [time-nuts] LED reliability

In message <20080430165656.3C300BE3B at ip-64-139-1-69.sjc.megapath.net>, Hal Murr
ay writes:

>> LEDs been viable since at least the early 70's?  Talk about planned
>> obsolescence... 
>How reliable were the early LEDs?  When did they start to get used in high 
>reliability applications?

Many of them are still happily emitting their faint red or green light.

>The best reliability story I heard (many years ago) was about installing 
>another trans-Atlantic telephone cable.  They used tubes long after 
>transistors were out.  They knew how long the tubes would last.  They didn't 
>have much data on transistors yet.

Actually, that's not entirely correct:  They had reliability info
on transistors and they sucked.

Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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