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Lambert (unit)

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Subject: ML, Stilb (unit), Lambert, Non-SI metric units, Luminance
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Lambert (unit)

The lambert (symbol L, la or Lb) is a non-SI 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).


1 lambert (L) = \frac{1}{\pi} candela per square centimetre (0.3183 cd/cm²) or \frac{10^4}{\pi} cd m−2

See also

Other units of luminance:


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