In article ,
"Mary Fisher" writes:
sob

Might there be something produced in the next few years which might even
last only, say, twenty years? That would do me :-)

Already exists -- Philips QL lamp (electrode-less compact fluorescent).
AFAIK, not available to the public because they are expensive and the
long life depends on specially designed fittings. Used for the back-
lighting of Big Ben's clock faces, amongst other things.

And that was a rhetorical question, a merry quip ...

Well, it had an answer...

--
Andrew Gabriel