From: utzoo!decvax!harpo!eagle!mhtsa!allegra!phr
Newsgroups: net.invest
Title: Re: bulb saver
Article-I.D.: allegra.643
Posted: Tue Nov 30 20:42:25 1982
Received: Wed Dec  1 06:46:58 1982

As I understand it, bulb savers are negative-coefficient thermistors
which reduce the shock to the filament after the light is turned on.
They do not appreciably reduce the amount of light produced (or power
used) by the bulb, after they've warmed up for a fraction of a second.