Future Photometry Based on Solid-State Lighting Products - Joint Research Project of European Metrology Institutes

Luminous flux (lm) and active electrical power consumption (W) of new SSL products coming to market are measured at test laboratories in order to determine the luminous efficacy (lm/W) and energy class of the products. Due to the fact that spectral responsivities of V(λ)-filtered photometers differ from the defined CIE V(λ) curve, all photometers are typically calibrated using incandescent light with correlated colour temperature (CCT) of 2856 K. This causes unwanted spectral errors in the measurements of SSL products at test laboratories and also in the field due to the large differences in the spectra of calibration sources and the light being measured, and in many cases cannot be corrected for. The EMPIR (European Metrology Programme for Innovation and Research) project 15SIB07 PhotoLED addresses the obsolescence of traditional incandescent standard lamp technology used in photometry and the need to support the introduction and uptake of solid-state lighting (SSL) products. It develops and validates the basis for a new photometric system based on white LEDs, by developing new LED-based calibration sources and measurement techniques supporting the specific properties of the new light sources and detector technology including illuminance measurement of the new LED-sources without optical V(λ)-filters in the calibration of photometers and measurement facilities used for determining the energy efficiency of new SSL products coming to market. The project started in September 2016. We will report on main targets of the project, current status of the achieved research results and plans of project results in industrial uptake. Our presentation will as well include latest research results of CMI team within the project.