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Light pollution control enters a rule-of-law phase as urban light environment optimization accelerates.
Published Time:
2025-11-24
As urbanization accelerates, light pollution has emerged as the fourth major environmental issue—following water, air, and noise pollution—and is now drawing widespread public attention. At the Third China Conference on Lighting Science and Technology, Professor Yang Chunyu from Chongqing University pointed out that light pollution in Chinese cities is trending toward "wider geographic coverage, increased intensity, and greater diversity of types." This not only poses risks to human health but also causes significant damage to ecosystems. As a result, addressing light pollution has entered a new phase characterized by legal regulation and scientific approaches.
Light pollution is primarily categorized into three types: glare pollution, artificial daylight, and colored light pollution. Its sources span across various sectors, including reflective materials on building exteriors, road lighting, advertising signs, and landscape illumination. Research indicates that prolonged exposure to excessively bright lighting environments can lead to health issues such as sleep disorders, impaired vision, and endocrine disruptions. Moreover, excessive nighttime lighting in urban areas can disrupt the natural growth rhythms of plants and animals, affecting insect reproduction and bird migration patterns. Currently, several regions in China have introduced local regulations to combat light pollution, such as the "Shanghai Environmental Protection Regulations" and the "Shenzhen Urban Lighting Management Measures," which explicitly set limits on the reflectivity of glass curtain walls in buildings and establish guidelines for the timing and brightness of outdoor advertising lights. At the national level, the "Urban Lighting Planning Standard" (GB 50550-2010) is continuously revised and refined, integrating light pollution control into the broader framework of urban planning.
Addressing light pollution requires the coordinated efforts of technological innovation and effective management. On the technical front, industry players are introducing products such as low-glare lighting fixtures and intelligent dimming systems, which optimize light distribution through advanced optical designs to minimize stray light. Additionally, warmer-toned light sources are being adopted instead of harsh cool white lights, helping to reduce disruptions to human circadian rhythms. From a management perspective, experts recommend establishing a comprehensive monitoring and evaluation system for light pollution, while exploring a "zoned control and categorized guidance" approach. This would involve setting differentiated lighting standards tailored to specific urban functional zones. Meanwhile, public awareness campaigns should be intensified to foster greater environmental consciousness about light pollution. Several cities have already initiated pilot projects aimed at transforming their urban light environments. For instance, Beijing’s Olympic Park has successfully reduced nighttime illumination brightness by 30% through optimized landscape lighting plans—while still preserving the striking visual impact of its core areas. Similarly, Hangzhou’s West Lake scenic area has implemented an intelligent control system that ensures harmonious coexistence between artificial lighting and the natural surroundings. With ongoing technological advancements and refined policy frameworks, tackling light pollution will gradually evolve toward "precise prevention and scientific optimization," ultimately driving urban light environments toward healthier, more comfortable, and energy-efficient outcomes.
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