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Neon signs are fueled (if reddish-orange) most likely by a bit of neon plasma. Neon is an inert gas. Atomic number, 10. (Group 18, in case 'inert gas' didn't give it away.) Other-coloured neon signs are merely Mercury vapor discharge exciting phosphors or other noble gases. Sunlight is warmth that comes from the sun. Solar radiation. Neon signs: artificial. Sunlight: natural.

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