Energy at a specific wavelength radiated onto an object of unit area per unit time. Standard measurement unit W m-2 µm-1.
The monochromatic irradiance of a surface per unit bandwidth at a particular wavelength, usually expressed in Watts per square meter-nanometer bandwidth.
The irradiance per unit wavelength or wavenumber interval. Units are typically W m−2 μm−1 or W m−2(cm−1)−1.