wrote:

Roly wrote:

If the original instructions have been lost, is there an easy way to
determine the correct volt and power rating of a given bulb ?

put a bulb on 6v, that will tell you whether its 6v or 12v. Thats
usually all you need to know.


That's all very well, but I know that some bulbs are 3V. So if the bulb
glows very brightly for just a moment, I can assume it used to be a 3
volt one.

I've been messing about with a variable power supply and a current meter
to see if a bulb glows at a similar brightness to existing ones. The
idea is to try and reconcile orphaned spare bulbs with their original
sets. I'm rather astonished at just how many variants there seem to be.

But I'm more astonished that there doesn't seem to be any known source
for these bulbs.