Reflex – Glare from reflected sunlight

The are no universal guidelines or thresholds for reflected sunlight in the public space. In this project, physical parameters for an objective description and quantification of a «discomfort glare» from reflected sunlight are elaborated. Furthermore, the scattered reflection (bidirectional reflectance distribution function, BRDF) of several glass types and other materials of the building envelope is measured in order to generate an extensive database. This database can help to evaluate the «discomfort glare» from solar installations and other surfaces of the building envelope already in the planning phase. New materials or surfaces can be compared with standard materials of the database in order to assess their effect concerning glare from reflected sunlight.