Andrzej Rybczyński is a graduate of Poznań University of Technology, the Faculty of Computer Networks and Distributed Systems. He is a PhD Student and member of GL OPTIC R&D team. Andrzej was the project leader responsible for developing calibration equipment and spectral irradiance standard installed in Calibration and Research Laboratory of Optical Radiation (CARLO). His areas of interest include uncertainty of spectral measurements and optical radiation of welding arcs. He is a member of CIE Poland and takes an active part in IndIr-UV and HiPoSisAs projects carried out by Partnership for European Research in Occupational Safety and Health (PEROSH).