Date:         Sun, 17 Mar 2002 21:19:21 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: High beam blue LED
Comments: To: John McLean <jaymac@INTERNETCDS.COM>
In-Reply-To:  <3C951D4E.3DBE6B@internetcds.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 05:48 PM 3/17/2002, John McLean wrote:
>I'll have to admit I would'nt know the difference between incandescent and
>LED.

Sure you do.  Incandescent is just a regular little ol' light bulb, works
by heating a wire white-hot.  If you pull the blue plastic cover off the
headlight warning bulb it looks quite a bit like the bulbs for MiniMag
flashlights.

>  However
>everyone (including my Bentley - copyright 1991) refers to these indicater
>bulbs as LED's.

Except for the headlight indicators, which are called out as "bulbs" on
both 90.8 and 90.18...there's also specific mention of how to install it
(different from LEDs) on 90.9 figure 9, called out in the pictures on 90.6
and 90.7 (which are for Canadian '80-'84).  The reference on 90.2, .3, .4
for '80-'84 USA models refers to an LED all right -- a red one, which
they'd clearly abandoned by '84.  Note that the series resistor for the
LEDs is 470 ohms, while that for the bulb is 270 ohms.

Granted the Bentley is full of mistakes and omissions in this whole section
-- you have to fish around a bit to find what you need, especially since
they accidentally left the table of resistor values out of Fig. 4 on 90.18.

david


--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"