Light & Engineering Vol. 23, No. 3, pp. 48-54, 2015 Svetotekhnika No. 4, 2015, pp. 23-27 CHALLENGES OF NEW STANDARDIZATION IN LIGHT MEASUREMENT OF SSL-PRODUCTS Gьnther Leschhorn Instrument Systems, Germany E-mail: webinfo@instrumentsystems.com ABSTRACT The basic requirement for development and advancement of good lighting systems is provided by precise and reliable measurements. <...> International standards ensure that different laboratories across the world apply uniform measurement conditions and that the results obtained can be compared with each other. <...> In the past, there has been no standard of this kind for photometric data from LED lamps and luminaires. <...> This “unstandardized” era has come to an end over the past few months. <...> A draft standard has now been drawn up by the International Commission on Illumination (CIE). <...> In the future, this new standard will provide a platform for international standardization when taking photometric measurements from Solid-State Lighting (SSL) sources. <...> This article presents the key content of the standard and outlines the associated challenges to users. <...> It also provides examples for correct application of the new standard. <...> Keywords: standartization, SSL lighting, goniospectroradiometer, tolerance interval, accteptance interval BACKGROUND TO STANDARDIZATION FOR MEASUREMENT PROCEDURES USED IN TESTING SSL PRODUCTS In the past, the lack of alternatives has meant that since 2008, the IES LM-79–2008 testing method developed by the subcommittee “Solid-State Light48 ing” of the Illuminating Engineering Society (IES) “Testing Procedures Committee” has effectively been used as the international standard for measurements taken from SSL products. <...> However, as a purely North American standard, the LM-79 lacked the coverage of worldwide accreditation. <...> A number of national documents, such as the draft standard DIN 5032–9 in Germany, the CQC and GB Standards in China or the JIS Test Methods in Japan, existed in parallel to the North American standard. <...> Over a period of many years, standardization committees have been working to close this gap by creating an international standard. 2013 therefore saw publication of the European standard prEN 13032–4:2013, which had been developed by the Working Group WG7 “Photometry” of the Technical Committee CEN/TC 169 “Light and Illumination”. <...> The secretariat of this committee is managed by the DIN German Standards Organization. <...> The “Photometry” Working <...>