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Neon.
I'm not aware of any other sort of electric lamp that a reasonable number of living people know how to manufacture on a small, local scale with simple technology: all you really need are glass tubes, relatively pure neon/argon/mercury, heat (forced air natural gas torches), and a good vacuum pump. It happens to be energy efficient, also.
The components themselves (glass tubes, transformers) strike me as fairly impervious to EMF, too, if you're worried about some sort of nuclear devastation/sunspots knocking things out -- I think you'd have a better chance of scrapping and salvaging neon than a fluorescent system, anyway.
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