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boxdoctor · 14th Jun 2019, 1:10 pm

Reading posts #63 to 66, I am reminded of the well-known effect of filament migration experienced with tungsten filaments operating on D.C. supplies in a vacuum, where tungsten filament particles migrate to the + end of the incandescent filament. I wonder, does halogen suppress this action?
Also BTW, I remember some company often advertising in the Daily Express in the early fifties(?) a "Long life" light bulb with a rating of, I think, 100w, with a claimed life of 2000 hours.
They probably sold well, as the ads ran for several years, as I recall. Tony.

14th Jun 2019, 1:10 pm	#68
boxdoctor Rest in Peace Join Date: Sep 2010 Location: Ripley, Derbyshire, UK. Posts: 785	Re: The lightbulb conspiracy Reading posts #63 to 66, I am reminded of the well-known effect of filament migration experienced with tungsten filaments operating on D.C. supplies in a vacuum, where tungsten filament particles migrate to the + end of the incandescent filament. I wonder, does halogen suppress this action? Also BTW, I remember some company often advertising in the Daily Express in the early fifties(?) a "Long life" light bulb with a rating of, I think, 100w, with a claimed life of 2000 hours. They probably sold well, as the ads ran for several years, as I recall. Tony.