How long will a neon sign last?

The ultraviolet light emitted by the mercury discharge within a tube is absorbed by the coating, which subsequently emits light of a different color (and with a lower photon energy). Neon tubes can be produced in curved artistic shapes to form letters or pictures. The color of the light depends on the gas in the tube. Major cities in the United States and several other countries also had elaborate neon signs. How do neon signs get their color?...

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