spectral radiant exitance, Mλ 

https://doi.org/10.1351/goldbook.S05825
The radiant exitance, M, at wavelength λ per unit wavelength interval. The SI unit is W m−3, but a commonly used unit is W m−2 nm−1.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2276 [Terms] [Paper]
Citation: 'spectral radiant exitance' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05825 RIS BibTex EndNote
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Last revised: February 24, 2014