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) = candela per square centimetre (0.3183 cd/cm2) or 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