Irradiance of a surface area per unit frequency or wavelength. The phrases spectral flux density or maybe more confusingly "spectral depth" can also be utilised. Non-SI models of spectral irradiance include Jansky = 10 W⋅m⋅Hz and solar flux unit (1SFU = ten W⋅m⋅Hz). not much in quantity; a light https://xiaopingk319fox7.wikitron.com/user