Photodegradation of Unmodified and Thermally Modified Wood Due to Indoor Lighting

Considering interior applications, sunlight, both direct through open window and glass, artificial lighting are the main sources of radiation possessing sufficient energy to trigger photodegradation processes in wood. LED lamps, which emit mostly visible light, becoming dominant light source various interiors. In present study, thermally modified (TM) unmodified (UM) ash (Fraxinus excelsior), aspen (Populus tremula), pine (Pinus sylvestris) due exposure UV lamps was evaluated compared by analysing wood discolouration (CIELAB colour space), changes reflectance FTIR spectra, formation water-soluble components. The results show that, apart from radiation, may cause considerable TM UM resulting visually perceptible change, alteration chemical structure Improved photo-stability observed for exposed while even more spectra were detected than experiment with lamps. Comparing wood, quite similar all species significant differences case