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The Deep Underground Neutrino Experiment (DUNE) is a leading-edge experimentdesigned to perform neutrino science and proton decay searches. In particular,the far detector will consist of four 10-kton Liquid Argon (LAr) TimeProjection Chambers using both single and dual-phase technologies. The latterprovides charge amplification in the gaseous phase. In order to optimize thesedesigns, two large prototypes are taking data at CERN since 2018. Previously, adual-phase 4-tonne demonstrator was constructed and exposed to cosmic muons in2017 and exhibited good performance in terms of charge and light collection.The light detection system is important to provide a trigger to the chargeacquisition system and to obtain additional information from the scintillationlight produced in the particle interaction. In the demonstrator, five cryogenicphoto-multipliers were installed with different base polarity configurationsand wavelength shifting methods. During the detector operation, scintillationlight data were collected in different drift and amplification fieldconditions. An overview of the light detection system performance and resultson the light production and propagation are presented. Our studies allowed toimprove the understanding of some LAr properties.

Analysis of the light production and propagation in the 4-tonne dual-phase demonstrator