Re: Nernst Lamps
When I was at university (from 1974 to 1981) the IR spectrometer used a Nernst glower. The trick for long life was not to turn it off. It would last about a year, and I kept a small stock of the things to keep the spectrometer operating.
I needed the spectrometer functional because I was working at wavelengths up to 20um, and so needed it to check and calibrate the transmission spectrum of the optics.
I forget entirely what brand that Spectrometer was. Almost certainly a 1960's vintage instrument.
Craig
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