Measurement dataset produced during a measurement intercomparison campaign at PTB in October 2025

The measurement intercomparison campaign for spectral irradiance was organised within the NEWSTAND project at PTB in Braunschweig in October 2025. Participants in the campaign were project consortium members. New broadband sources developed within the project were brought to PTB for measurement. These sources as well as other various sources from different end user applications were measured for spectral irradiance during the campaign. The measurements were carried out by the consortium members using their characterised and calibrated array spectroradiometers. A well-characterised and calibrated double-monochromator-based scanning spectroradiometer provided by PTB was used as a reference spectroradiometer for the measurement comparison. Please see the _Readme.txt file within the zip file for further details about the provided data. This measurement data was used in the intercomparison reports published in this Zenodo community.