You wrote:
Then there were the "bulb savers"--small
discs probably containing
nothing more than a carbon resistor that were placed in the bottom of
an Edison-base lamp socket between the bottom contact of the socket
and the end contact of the bulb. I wonder if these were ever
encountered in the UK--it would seem that one would interfere with
the bayonet-style lamp sockets used there.
I've seen products that match this description (in the US) that
contain a diode, which gets placed in series with the bulb. They
work great if you like dim yellow light.
I don't. ;)
-Dave
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007