radiant (energy) flux [obsolete], \(P\), \(\mathit{\Phi}\)

https://doi.org/10.1351/goldbook.R05044
This obsolete term is not recommended. In @[email protected], @[email protected], \(P\), is adopted. SI unit is \(\text{W}\).
Note:
\(P\) is preferred, because in @[email protected], \(\mathit{\Phi}\) is reserved for @[email protected]
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 409 [Terms] [Paper]