photobiology: ’Photobiological’ Calculations. Definitions of classes, methods, operators and functions for use in ’photobiology’ and radiation meteorology and climatology. Calculation of effective (weighted) and not-weighted ’irradiances’/doses, ’fluence’ rates, ’transmittance’, ’reflectance’, ’absorptance’, ’absorbance’ and diverse ratios and other derived quantities from spectral data. Local ’maxima’ and ’minima’. Conversion between energy- and photon-based units. Wavelength interpolation. Astronomical calculations related solar angles and day length. Colours and vision.

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