The research projects

LED lighting has a specific technology: - its optical performance and lifetime depend on the junction temperature of the LEDs and evolution over time is manifested by a very slow decline in the emitted flux  - LEDs have specific radiation spectra with a blue peak for the most common technology  - radiation is produced on small surfaces with no optics of concentration and therefore can be seen by the human eye with as very high intensity source points  - LEDs require specific electronics to be able to operate with electrical characteristics poorly taken into account in current

The European project, coordinated by the SFI-Davos (Switzerland), aims to develop methods for measuring direct, diffuse and global solar spectral irradiance between 290 nm and 400 nm with an uncertainty of 1% to 2% and new instruments for rapid measurement of spectral irradiance (UV to TF spectroradiometers) to take into account rapid variations in atmospheric conditions (measurement duration less than 10 s and repetition time less than 1 min).