Lambert (unit)

{{short description|Non-SI metric unit of luminance}}

The lambert (symbol L{{Cite web |title=lambert |url=https://www.ies.org/definitions/lambert/ |access-date=2024-11-05 |publisher=Illuminating Engineering Society |language=en-US}}{{Cite web |title=Luminance {{!}} Photometric Brightness {{!}} Nit {{!}} Stilb {{!}} Apostilb {{!}} Blondel {{!}} Lambert {{!}} Footlambert {{!}} Skot |url=https://www.schorsch.com/en/kbase/glossary/luminance.html |access-date=2024-11-05 |website=www.schorsch.com}}) 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).