Light & Engineering Vol. 24, No. 1, pp. 45-50, 2016 Svetotekhnika No. 1, 2016, pp. 21-24 SELECTED PROBLEMS IN MODERN METHODS OF LUMINANCE MEASUREMENT OF MULTISOURCE LED LUMINAIRES Sebastian Słomiński Warsaw University of Technology, Faculty of Electrical Engineering, Lighting Division E-mail: sebastian.slominski@ien.pw.edu.pl ABSTRACT At the time of rapid development of LED technology, certain problems are associated with the measurement of the luminance distribution of multi-source LED luminaires. <...> The construction features of luminaires which form luminous intensity distribution by means of lens systems causes problems in achieving high values of luminous intensity, at a level of 100.000 cd in particular directions, is associated with high values of the luminance, often getting levels higher than 10 million cd/ m2. <...> Despite the rapid development of measurement techniques and the widespread use of imaging luminance measuring devices (ILMD), the appropriate luminance measurement of multi-source luminaires very often leads to errors. <...> Technical problems substantially affecting the accuracy of the luminance measurement of small objects are presented in this paper. <...> Taking into account the rapid digitization of measurement methods in lighting technology, paying special attention to increasing measurement errors acquires a particular importance. <...> Keywords: lighting technology, glare, imaging luminance measuring devices (ILMD) INTRODUCTION The development of LED technology and common problems, which arise during design and implementation of the new solutions, necessitate the dynamic growth of measurement methods. <...> High luminance values of LEDs, which are close to and many times higher than the luminance values of discharge lamps [1,2], provide huge opportunities while designing lighting fixtures featuring high luminous intensity amplification in specific directions. <...> Luminous intensity amplification values are mostly more than 500-fold. <...> The relative ease, with which luminous intensity distribution of high luminance light sources can be shaped by means of lens, reflector and hybrid systems equipped with optics, means a deluge Fig. 1. <...> Example luminance distribution on the surface of a) – church and b) – street 45 Light & Engineering Vol. 24, No. 1 Fig. 2. <...> Example luminance distributions on the street surface a) digital luminance camera <...>