The performance of the participating spectroradiometers will be assessed against a set of calibrated ESTI spectroradiometers by measuring:natural sunlight in clear sky conditionsartificial light using the steady-state large area Apollo solar simulatorFEL standard lampsSeveral performance statistics indicators will be calculated, with focus on the relative spectral content in different spectral bands.

The results will be published by the JRC in an official report.

 All the participants will have access to the entire dataset of spectra acquired by the group, including the reference data.

Several other prototypes and custom sensors are also eligible for participation and the report foresees a dedicated section for these instruments if they are not directly comparable with reference instruments.

Launched in 2011, the first ISRC edition focused primarily on photovoltaic (PV) research and application.

Over the years, the range of interested participants has gradually differentiated, encompassing not only laboratories in the PV field, but also space agencies, national metrological institutes (NMI), universities, research groups and manufacturers of measurement equipment operating in the fields of climatology and meteorology.

6 FEBRUARY 2025ISRC 2025 - Invitation and instructionsEnglish(232.

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