Measurements of spectral daylight variation in spaces: A case study

Norwegian University of Life Sciences, Faculty of science and technology, Ås, Norway

^* Corresponding author: tobias.kristiansen@nmbu.no

Abstract

This study investigates spectral daylight quality measured in a classroom within a time span of 30-minutes under clouded sky conditions. There is a characteristic difference between vertical and horizontal measured values, where the traditional vertical measurements tend to have greater peak wavelength irradiance reduction. The findings show the importance of considering multi-directional views when considering visual and non-visual light effects. The study indicates that spectral variations and spatiality should be considered when evaluating daylight, in contrast to the static methods commonly used to evaluated the quality of daylight in buildings. The study underscores the need for simulation tools and material databases to enhance the realism of spectral simulations and ultimately contribute to a more effective approach to indoor daylight quality, prioritizing occupant well-being.