Borui, Chen; Barrett, Edward; Efthymiopoulos, Spyros; Altamirano, Hector; (2022) Effect of indoor lights on the development of Aspergillus versicolor in buildings. In: Proceedings of the People and Buildings 11th Master Conference (MC2021/22). (pp. pp. 1-6). Energy and Climate Change Division - University of Southampton

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Abstract

The presence of moulds inside buildings has been a growing concern as it may affect the integrity of buildings and the health of occupants. Most studies have focused on growth conditions involving moisture, temperature and construction materials. Though moulds are known to have light responses, ranging from developmental regulating to metabolites producing, it is unclear whether they respond to light levels found indoors. This study analysed the influence of indoor light of varying colour temperature and illuminance on germination, growth and sporulation of Aspergillus versicolor. Mould germination was not significantly affected by colour temperature or light intensity. The development of mycelia was inhibited when completely exposed to light (1050 lx), both warm and cool lighting, and the cool colour temperature had a stronger effect. If the illuminance increases from darkness to 1050 lx, changes in the morphology and biological process were observed. Colonies exposed to high illuminance were high and denser; however, incubation under dark or weak light intensity triggered mould conidiation earlier. This difference in light responses of A. versicolor may result from protective mechanisms against environmental or light-relevant stress. With the results, this study demonstrates the role of indoor lights in regulating fungal development in buildings.

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