photon flow, Φ p

The number of photons (quanta, $N$ ) per unit time. ( $d N d t$ , simplified expression: $Φ p = N t$ when the number of photons is constant over the time considered). The SI unit is $s −1$ . Alternatively, the term can be used with the amount of photons (mol or its equivalent einstein), the SI unit then being $mol s −1$ .

See: spectral photon flow