11 Light sources for measurement purposes, namely deuterium light sources, beam light sources, halogen light sources, infrared sources, spectral calibration lamps with discrete spectral lines for wavelengths calibration, calibrated light sources as flux standards, homogeneous light sources as radiance standards or radiant intensity standards, monochromic light sources, light sources with fiber optics, light sources for solar simulation, light sources for photo resist exposure; special lamps for scientific and technical purposes; parts of all these products