Irradiance of a surface area for every device frequency or wavelength. The terms spectral flux density or even more confusingly "spectral depth" are also employed. Non-SI models of spectral irradiance involve Jansky = 10 W⋅m⋅Hz and solar flux unit (1SFU = 10 W⋅m⋅Hz). not much in quantity; a light https://harrisonp642pyh1.ouyawiki.com/user