This function gives a set of numeric multipliers that can be used as a weight to calculate effective doses and irradiances.
numeric array of w.length (nm)
a numeric array of the same length as
w.length with values for
the BSWF normalized as in the original source. The returned values are
based on quantum effectiveness units.
For wavelengths shorter than 256 nm the value returned by the equation starts decreasing, but we instead extrapolate this maximum value, obtained at 256 nm, to shorter wavelengths. For wavelengths longer than 345 nm we return zero, as is usual parctice.