VTT Technical Research Centre of Finland Ltd is the National Metrology Institute of Finland. The research and maintenance of national quantities is run by the MIKES Metrology group that joined VTT Ltd in the beginning of 2015. VTT Ltd together with MIKES Metrology has years of experience in developing new detector technologies and metrology for LEDs and SSL products. VTT Ltd is the coordinator of the PhotoLED project.

Metrology Research Institute of Aalto University is the National Standards Laboratory of optical quantities in Finland. Aalto and MIKES Metrology of VTT Ltd work in very close collaboration in the Otaniemi campus area in Espoo. Aalto has a vast experience in developing detectors and measurement methods for photometry and radiometry of LEDs.

Government Office of the Capital City Budapest ( BFKH, Budapest Főváros Kormányhivatala) is the National Metrology Institute of Hungary. The optical section of the Metrological and Technical Supervisory Department has a long history (70 years) and most of BFKH's measurement setups are self-built. BFKH's experience is demonstrated in the field of radiometry, photometry and optical properties of materials within 7 CCPR Key Comparisons.

Czech Metrology Institute (CMI) is the National Metrology Institute of the Czech Republic. CMI offers cooperation and metrological services at the highest technical level for all manufacturers, suppliers, laboratories and customers in all areas of science and industry. CMI's department of Optical Radiometry and Photometry has excellent capabilities in the scientific-technological field.

The Laboratory for Photometry and Radiometry within Spanish National Research Council ( CSIC, Consejo Superior de Investigaciones Cientificas) is a Designated Laboratory for optical radiation measurements in Spain. CSIC has been developing comprehensive and high accurate facilities in radiometry, photometry, and optical properties of materials for many years in the UV, visible, and IR ranges.

DTU Fotonik is the department of photonics engineering at the Technical University of Denmark. The main areas of research are light sources and industrial sensors, nanophotonics, dynamic photonics and communication technology. The institute houses extensive experience on a broad range of optical fields, specifically solid-state lighting, and light measurement, which is done in close collaboration with Danish industry.

École nationale des travaux publics de l'État (ENTPE) is a French engineering school and is part of University of Lyon. The Civil Engineering and Building Laboratory is one of the major players regarding research in buildings in France; in particular, it is involved in lighting, thermic and acoustics. It performs research relying on light measurement, light source quality and characterisation of solid state lighting.

National Institute of Metrological Research ( INRIM, Istituto Nazionale di Ricerca Metrologica) is the National Metrology Institute of Italy. INRIM's task is to carry out and promote scientific research in metrology, new technologies and materials. INRIM carries out studies and research on the realisation of primary standards for the basic and derived units of the International System of units (SI), assures the maintenance of such standards.

LMT Lichtmesstechnik GmbH Berlin has been manufacturing photometers, colorimeters, goniophotometers, and other light measurement instruments in Berlin, Germany since 1974. Since the very beginning, LMT has aimed to develop, produce, and support highest precision photometric measurement instrumentation, ranging from hand-held instruments for light measurement to complex automatic goniophotometric measurement systems for the general lighting and automotive industry.

Federal Institute of Metrology (METAS) is the National Metrology Institute of Switzerland. Roughly 50 % of its activity is research and development on basic and applied metrology, about 20 % covers work on legal metrology, with much importance attributed to the provision of commercial calibration and measurement services for industry and research. The optics laboratory of METAS is very much involved in pre-normative and normative work at national, regional and international level.

Metrosert is the National Metrology Institute of Estonia. Metrosert has participated in various projects related to development of standard detectors based on silicon photodiodes for optical radiometry. Metrosert has skills in modelling and manufacturing of special type of photodetectors implementing commercially available photodiodes.

OSRAM is one of the three big manufacturers of lamps, of both traditional types and new and rapidly developing LED solutions. In this context, the role of the "Central Laboratory for Light Measurements" is the dissemination of OSRAM light standards for calibration of measurement equipment to all quality departments in plants worldwide, the development of new and improved measurement and calibration procedures, and the support of metrological tasks at the demand of departments.

OSRAM Opto Semiconductors (OS) has continued to stay the world's second largest manufacturer of optoelectronic semiconductors for the illumination, sensing and visualisation sectors. OSRAM OS combines extensive know-how in semiconductor technology, opto-electronic and converter materials and packages under one roof.

The Physikalisch-Technische Bundesanstalt (PTB) is the National Metrology Institute of Germany. PTB offers measurements and calibrations with great care at the highest metrological level in science and technology. The division "Optics" has demonstrated its experience in the field of optical technology, applied radiometry, photometry and time and frequency with many international Key Comparisons where PTB has acted as CCPR and EURAMET Pilot laboratory.

RISE Research Institutes of Sweden AB is the national institute for technical evaluation, research, testing, certification, metrology, and calibration. The Photometry and Radiometry group of RISE acts as the National Metrology Institute and performs calibrations in these fields to customers world-wide. The group also performs extensive testing of related products and has been evaluating lifetime performance of both traditional and more novel light sources for more than 20 years.

Signify is the global market leader in lighting. Signify is leading in the transformation from lamp based lighting solutions to LED based lighting solutions. It is the ambition of Signify to improve people's lives with light by delivering unique value and energy efficient solutions to consumers and professional customers, every day, everywhere.

Van Swinden Laboratory (VSL) is the National Metrology Institute of the Netherlands. VSL's task is to carry out and promote scientific research in metrology, new technologies and materials. VSL carries out studies and research on the realisation of primary standards for the basic and derived units of the International System of units (SI), and assures the maintenance of such standards. The Optical Technology Group of VSL has its main competence in the field of radiometry, photometry and radiation thermometry.