Quantity Catalog - Luminous flux, Luminous power
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  (luminous flux base)  cd*sr

Luminous flux, also known as luminous power, measures the total amount of visible light emitted by a source in all directions.

  lumen  lm

1 lm = 1.0 cd*sr; The unit "lm" represents luminous flux or luminous power, measuring the total amount of visible light emitted by a source. It is commonly known as the lumen.


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