Irradiance of a surface area for every unit frequency or wavelength. The conditions spectral flux density or more confusingly "spectral depth" are utilised. Non-SI units of spectral irradiance include things like Jansky = 10 W⋅m⋅Hz and photo voltaic flux unit (1SFU = ten W⋅m⋅Hz). The Dean of Units Hub https://jimc096zjr5.wikiannouncement.com/user