Some electrons circling around the gas and metal atoms are excited by these collisions, bringing them to a higher energy state.
LAMP | Arc lamp | LED lamp | LAMP (software bundle) | lamp (electrical component) | Lamp | lamp | arc lamp | The Blue Lamp | safety lamp | Neon lamp | High-intensity discharge lamp | Compact fluorescent lamp | Carbide lamp | ''When It's Lamp Lighting Time In The Valley'' | When It's Lamp Lighting Time in the Valley | Tiffany lamp | ''The lady with the lamp'' — Miss Nightingale at Selimiye Barracks | Signal lamp | Safety lamp | Oil lamp | Metal-halide lamp | Hefner lamp | Fluorescent lamp | Electrodeless lamp | Davy lamp | Butter lamp | Argand lamp with circular wick and glass chimney. (Illustration from ''Les Merveilles de la science'' 1867-1869 | Anglepoise lamp | Aladdin and His Lamp |