## spectral photon radiance, $$L_{\textrm{p}\lambda}$$

https://doi.org/10.1351/goldbook.S05822
The @P04639@, $$L_{\text{p}}$$, at @W06659@ per unit @W06659@ interval. The SI unit is $$\mathrm{s}^{- 1}\ \mathrm{m}^{- 3}\ \mathrm{sr}^{- 1}$$, but a commonly used unit is $$\mathrm{s}^{- 1}\ \mathrm{m}^{- 2}\ \mathrm{sr}^{- 1}\ \mathrm{nm}^{- 1}$$. Alternatively, the term can be used with the amount of photons (mol or its equivalent @E01914@) the SI unit then being $$\mathrm{mol}\ \mathrm{s}^{- 1}\ \mathrm{m}^{- 3}\ \mathrm{sr}^{- 1}$$ and the common unit $$\mathrm{mol}\ \mathrm{s}^{- 1}\ \mathrm{m}^{- 2}\ \mathrm{sr}^{- 1}\ \mathrm{nm}^{- 1}$$.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2276 [Terms] [Paper]