Lime lights, also known as calcium lights, were commonly used in theaters before the advent of electric lighting. They produced a bright, intense light by heating a piece of quicklime (calcium oxide) in a flame fueled by a combination of hydrogen and oxygen gases.

When the flame interacted with the calcium oxide, it caused a chemical reaction known as candoluminescence, resulting in the emission of a brilliant white light. The intense illumination produced by lime lights made them suitable for stage lighting, enabling actors to be seen clearly in large venues.

Candoluminescence in lime lights was a significant development in theater lighting during its time and played a crucial role in improving visibility on stage before the widespread adoption of electric lighting technologies.

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