Irradiance of a floor per unit frequency or wavelength. The phrases spectral flux density or maybe more confusingly "spectral depth" will also be applied. Non-SI units of spectral irradiance contain Jansky = ten W⋅m⋅Hz and photo voltaic flux device (1SFU = 10 W⋅m⋅Hz). At night, scan the horizon for https://maryv864scl2.yourkwikimage.com/user