Some action spectra standards are defined by simple equations; the erythemal spectrum for human sunburn is one of them.
a vector of wavelengths, in nm
This erythemal spectrum is defined in 4 pieces: λ<=298 , 298<=λ<=328 , 328<=λ<=400 , and 400<λ. All the units are nm. The spectrum is used in the definition of the international standard UV Index.
A colorSpec object with
quantity equal to
The responsivity is 0 for λ > 400 nm, so this putting this spectrum in the category
of human vision is a bit of a stretch.
McKinlay, A.F., and B.L. Diffey. A reference action spectrum for ultraviolet induced erythema in human skin. CIE Res. Note, 6(1), 17-22. (1987)