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A popular history with some slight relevance:
Once incandescent lamps were vacuum filled.
Then a nitrogen back fill increased life by reducing filament sputter.
But more energy was convected / conducted to the envelope.
Coiled coils helped conserve heating effect.
Then an argon, or better, a krypton fill was introduced,
to reduce heating of the envelope.
If envelope temperatures were not so high, it's possible that a plastic
jacket would conserve more energy inside. This might be the basis of
the e-coatings, possibly?
Musings on triple-glaze.
If double glazing reduced aperture loss by 50%, then another double glaze
would arguably reduce it another 50%, an aggregate of 75% reduction.
But if the break even period were 7 years for double, then for two double
glazes, it's conceivable the payback period would be 21 years.
That's too long.