A unit of luminance (brightness) in physics, named after Johann Heinrich Lambert; used to measure how much light a surface emits or reflects.
Named after Swiss-German polymath Johann Heinrich Lambert (1728-1777) in the 18th century. The unit was adopted internationally to standardize measurements of light intensity in scientific work.
Scientists named this unit after Lambert because he was so brilliant at measuring light that they figured his name should literally measure brightness—it's a pun disguised as physics!
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