Concerning Glare Measurement.

Experience with a newly developed visual function and glare measuring apparatus for optic measurement of disability glare is described. The mode of operation of this apparatus has been discussed in LICHTTECHNIK, Vol. 24 (1972), issue No. 5, pages 279-282. Measurements carried out with this apparatus showed that it can be applied easily in practice in order to determine disability glare caused, for instance, by street lighting. As glare-determining criterion, the increase of threshold luminance is used. For various street-lighting installations, for which the glare marks G had already been determined, the increase in threshold luminance corresponding to the glare marks could be established. The possibilities of limiting the occurrence of errors during measuring were also examined.