Some spectrometers will give illuminant values in units of irradiance
(uWatt * cm^-2), but physiological models require illuminants in units of
photon (quantum) flux (umol * s^-1 * m^-2). The functions irrad2flux
and flux2irrad allows for easy conversion of rspec objects
between these units.
irrad2flux(rspecdata)flux2irrad(rspecdata)
(required) a rspec object containing illuminant values.
a converted rspec object.