Rosemann, A.Kloss, S.-H.Müller, T.Aydinli, SirriKaase, Heinrich2019-01-082019-01-0820051477-1535https://depositonce.tu-berlin.de/handle/11303/8933http://dx.doi.org/10.14279/depositonce-8062Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.Light-pipes described in this paper guide light along an axis allowing it to escape from its surface for illumination purposes. Light is coupled into them by a beamer luminaire. The performance of a hollow light guide very much depends on the quality of the materials used to guide the light. The luminous characteristics of these materials influence a light-pipe’s overall performance. The first section of this paper describes measurement techniques for light incidence resolved measurements on materials. Common co-ordinate systems for describing the geometry and a data format to store the data are shown. The second section of this paper deals with light-pipe goniophotometry. A goniophotometer for light-pipes has been constructed at the Technical University of Berlin. To evaluate the results measurements are compared to these from a real installation.en620 Ingenieurwissenschaften und zugeordnete Tätigkeitenphotometryhollow light guideslight-pipesArticle1477-0938