Abstract
The outdoor light environment significantly affects aspects of public psychological and physiological health. This study conducted experiments to quantify the effects of the light environment on visitor light comfort in urban park pedestrian space. Nine sets of lighting conditions with different average horizontal illuminance (2 lx, 6 lx, 10 lx) and colour temperatures (5600 K, 4300 K, 3000 K) were established virtual reality scenarios. Subjective light comfort was evaluated, and electroencephalogram (EEG) was measured on 18 subjects to comprehensively study the effects of different light environments on human light comfort. The results of the comprehensive evaluation showed that colour temperature had a very significant impact on subjective light comfort, with warm light being generally more favourable than cool light in enhancing human subjective light comfort. The results of the EEG analysis show that the average horizontal illuminance is an important factor in the level of physiological fatigue, and that physiological fatigue can be maintained in a superior state at an appropriate level of illuminance. Based on the results of both subjective and objective factors, a comprehensive analysis was carried out to propose a range of average horizontal illuminance (4.08 lx, 6.99 lx) and a range of colour temperature (3126 K, 4498 K) for the comprehensive light comfort zone in urban park pedestrian space.
Highlights
As one of the most important public spaces in a healthy urban environment, urban parks are essential places for modern city dwellers to engage in various social activities [1, 2], relax, and relieve stress [2, 3]
The analysis showed that colour temperature had a highly significant negative correlation (p < 0:01) with all indicators except brightness
The entropy weight method (EWM) is an objective weighting method, and the principle of which is to determine the weights in the indicators based on the amount of information reflected in the degree of variation of each indicator value [68]
Summary
As one of the most important public spaces in a healthy urban environment, urban parks are essential places for modern city dwellers to engage in various social activities [1, 2], relax, and relieve stress [2, 3]. Light can affect human health [5], which can be both positive and negative [6]. Inappropriate ALAN can affect human emotions [7, 8], perception, evaluation, behavior [9, 10], and feeling of safety [11] and can even have a significant impact on physical health [5, 6, 12,13,14]. If humans are exposed to an uncomfortable light environment for a long time, such as insufficient brightness, uneven lighting, uncomfortable glare, and intense strobe light, it will cause serious harm to their physical health and affect their psychological health [12, 15, 16]
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