Conversation so far:
why does neon gas in a tube turn fluoresce bright orange when electricity is passed through it
Neon lights give an electrifying red orange colour due to each element giving off a few characteristic wavelengths of light when it's electrons are excited
When was neon gas discovered
Neon was discovered in 1898 by William Ramsay and Morris Travers at University College London.

Question: When was the lamp developed
Self-contained rewrite: When was the neon lamp developed