CIE x050-PP023 PDF

ALAN (artificial light at night) has changed the spectral composition of the night sky, disrupting the rhythms of natural ecosystems. In particular, the multicolour and high brightness of the nightscapes make the urban night present a chaotic and colourful scene. We therefore introduce the colour harmony theory for evaluating multiccolour lighting scenes. In this study, we collected hyperspectral data from 50 lighting scenarios in seven commercial districts in Shanghai. Utilizing the acquired hyperspectral data, we analyzed the luminance, chromaticity distribution, and colour harmony values of these districts. It was observed that modern architectural commercial districts (such as Lujiazui) exhibited a greater variety of colours compared to historical architectural districts (such as the Bund International Architecture Exhibition). This disparity can be attributed to the utilization of self-illuminating lighting methods in modern architecture, allowing for a broader range of colours, higher luminance levels, and increased colour harmony values. In contrast, historical buildings typically rely on floodlights for illumination, resulting in fewer colour options, lower luminance levels, and diminished colour harmony values.