
ideal surface for which the radiation coming from that surface is distributed angularly according to Lambert's cosine law NOTE - For a Lambertian surface, M = pL, where M is the radiant or luminous exitance, and L the radiance or luminance.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-04-57

A surface whose emission or scattering follows Lambert's Cosine Law, in which the radiant intensity leaving a surface is proportional to the cosine of the angle from surface normal. See Cosine Collector.
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http://www.intl-lighttech.com/support/glossary
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