Radiant fluence rate, or spherical irradiance, is equal to the total radiant flux incident on a small sphere divided by the area of the diametrical cross-section of the sphere.
Applicable units are those of quantitykind:RadiantFluence
Radiant fluence rate, or spherical irradiance, is equal to the total radiant flux incident on a small sphere divided by the area of the diametrical cross-section of the sphere.
$H_0 = \int_{0}^{\Delta t}{E_0}{dt}$, where $E_0$ is the spherical radiance acting during time interval with duration $\Delta t$.