spectral radiant energy density in terms of wavelength
ISO 80000-7:2019 Quantities and units — Part 7: Light and radiation
spectral radiant energy density in terms of wavenumber
spectral radiant energy density in terms of frequency
w_\lambda = \frac{\mathrm{d} w}{\mathrm{d} \lambda}
\mathsf{L}^{-2} \mathsf{M} \mathsf{T}^{-2}