I read an article about this bulb in a motorcycle magazine in 1972 or 3. The article was about the ride there. It did give some history of the bulb and if I remember correctly said the voltage was reduced to about half when the owners realized it was the Oldest Living Light Bulb. I believe that the Oldest Living Light Bulb was the title of the article.
Isn't manufacturing a bulb to a higher voltage rating than labelled used for what is called Long Life lamps?
