Date:         Tue, 18 Sep 2007 21:02:57 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: LVC adding LED interior lighting
In-Reply-To:  <46F09141.4060202@colorado.edu>
Content-Type: text/plain; charset=iso-8859-1

This is a solid proof that the LEDs are not serially connected or all
would have blacked out at the same time.

David

--- Richard A Jones <jones@COLORADO.EDU> wrote:

> > Keep in mind that the ideal design may have little meaning for the
> > application intended. 100,000 hour life of leds for use in flashlights
> > for example. How many sets of batteries would you need before you
> > approached the 100,000 hours of the bulb?
>
> Also, these "lifes" are statistical averages--like "mean time
> to failure" for disk drives.  I bought a 36 LED light for the
> Mountain Club cabin:
> http://store.sundancesolar.com/12v36ledbudi.html
> which has an advertised "approx 60,000-hour life" and it
> started failing very quickly--a few LEDs out, then more,
> then more.  When I sent it back ~1/2 of the LEDs were out
> or flickering.  Granted, this was not a single LED, but
> more complex.
>
> Maybe they are not "statistical averages" but "statistical
> predictions"....
>
> Richard
>



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