A unit of luminous intensity based on the light produced by a Carcel lamp, used historically to measure brightness.
Named after Bernard-Guillaume Carcel, a French inventor who created the Carcel lamp in the early 19th century; the unit became a standard in photometry.
Before electric light, the Carcel lamp's steady brightness was so reliable that scientists used it as the official measurement standard for light—basically the ancient version of a standardized lightbulb!
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