Glass Glossary

ISO-CIE Function

Last Updated: November 23, 2023

A method for calculating damage-weighted transmittance developed by the International Standards Organization (ISO), which uses a weighting function recommended by the International Commission on Illumination (CIE). This method assigns a specific damage weighted transmittance to each wavelength of UV and visible light according to its contribution to the fading of materials and fabrics. Its spectral range is from 300 to about 700 nm.