Diglio, Francesca (2024) Saving energy and promoting people's visual and non-visual needs: new strategies for integrative lighting indoors. [Tesi di dottorato]

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Abstract

The thesis aims to study different aspects influencing the achievement of good lighting indoors, i.e., lighting that fulfils occupants’ visual and non-visual needs and buildings’ energy performance requirements simultaneously in order to fill research gaps in current knowledge to achieve a comprehensive view of the topic and allow designers to choose among the available solutions the one that better balances visual, non-visual short-term and long-term effects of light, and energy saving issues. Through on-field experiments and numerical studies, the thesis investigates the following issues: (1) The short-term effects of the latest-developed daylight-mimicking LEDs on people’s comfort, mood, and work performance, specifically deepening the role of electric light correlated colour temperature and spectral power distribution; (2) The overall effects of spectral interactions between light and materials on the achievement of visual and circadian recommendations and energy power demands, highlighting the differences occurring when evaluating light-induced circadian response according to the different models currently adopted (the one based on Melanopic Equivalent Daylight Illuminance and the one based on the Circadian Stimulus); (3) The circadian implications linked to the use of daylight-linked control systems; (4) The accuracy and easy to implementation of different tools and methods for circadian effects prediction.

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