Re: push button switch lights

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

From: Mark Zvolanek <mzvolane@sydney.ipex.com.au>

>Does anyone know specs for light globe that goes into the switches for
>demister, front and rear fog lights on 1991 Audi 90. Two out of three
>have burnt out in my car. Can they be somehow replaced? I took the switch 

>apart and could not figure out how to take them out without the use
>soldering iron. Could they be replaced with high intensity LEDs in series 

>with some resistor? Has any tried this before?

I replaced a burned out lamp in the light switch of my 1984 80q with a 
standard yellow LED with appropriate series resistor.  It was completely 
invisible.  I had to extend its leads so that it was right up against the 
surface of the switch and even then it was only visible in fairly dark 
conditions.

OTOH, I replaced the burned out lamps in the window regulator switches of my 
1983 Avant with miniature red LEDs and these worked really well.  They were 
visible in twilight conditions.

I think the reason for the difference is that red leds appear brighter than 
yellow, and the plastic cover with the symbol on it is thicker in light 
switches than in window switches.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro
1989 Audi 100 Avant