| Summary: | The CoeLux<sup>®</sup> lighting system reproduces the true effect of natural sunlight entering through an opening in the ceiling, with a realistic sun perceived at an infinite distance surrounded by a clear blue sky. It has already been demonstrated that this new lighting system generates long-term positive effects on human beings; however, there are no investigations so far concerning the plant responses to CoeLux<sup>®</sup> lighting. To fill this gap, the model plant <i>Arabidopsis thaliana</i> L. was grown at four different distances from the light source, corresponding to four different light intensities (120, 70, 30, 20 μmol m<sup>−2</sup> s<sup>−1</sup>). High-pressure sodium lamps were used as control light. Plant phenology and morpho-physiological traits were monitored to assess for the first time the ability of plants to grow and develop under the light spectrum and intensity of the CoeLux<sup>®</sup> system. Plants grown at the lower light intensities showed a delayed life cycle and were significantly smaller than plants grown with more light. Furthermore, plants grown under the CoeLux<sup>®</sup> light type showed an additional deficit when compared to control plants. Overall, our results show that both the light spectrum and intensity of the CoeLux<sup>®</sup> system had a strong impact on <i>A. thaliana</i> growth performance.
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