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Related to radiant exitance: irradiance
(Units) the ability of a surface to emit radiation expressed as the radiant flux emitted per unit area at a specified point on the surface. Symbol: Me
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014