Analysis of sky luminance experimental data and comparison with calculation methods

► Absolute, relative and zenith Sky luminance data were compared with calculation models. ► Best luminance predictions are provided by the CIE model. ► If measured luminances are not available in one locality, the CIE model cannot be used. ► Absolute luminance are better predicted by the Igawa model. ► Relative luminance are better predicted by the Perez model.