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    • Source: Lambert (unit)

      • The lambert (symbol L) is a non-SI metric unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot-lambert, is used in the lighting, cinema and flight simulation industries. The SI unit is the candela per square metre (cd/m2).


      Definition


      1 lambert (L) =





      1
      π




      {\displaystyle {\frac {1}{\pi }}}

      candela per square centimetre (0.3183 cd/cm2) or






      10

      4


      π




      {\displaystyle {\frac {10^{4}}{\pi }}}

      cd m−2


      See also


      Other units of luminance:

      Apostilb (asb)
      Blondel (blondel)
      Bril (bril)
      Nit (nit)
      Stilb (sb)
      Skot (sk)


      References



      "Lighting Design Glossary: Luminance" at Schorsch Lighting Design Knowledgebase

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