In order to better address the issue of light pollution caused by outdoor lighting and maintain a balanced and comfortable lighting environment, the CIE (International Commission on Illumination) recently published the second edition of its technical report titled *“Guide on the Limitation of the Effects of Obtrusive Light from Outdoor Lighting Installationsâ€* (CIE 150:2017). This updated version builds upon the earlier 2003 edition, offering more detailed guidance on assessing the environmental impact of outdoor lighting. It outlines specific optical interference limits and measurement techniques for various environments, while also suggesting practical solutions for existing lighting systems that may contribute to light pollution.
Outdoor lighting plays a vital role in modern society, supporting activities such as nighttime logistics, sports events, security, landscape enhancement, and advertising. However, if not properly managed, this lighting can cause significant visual discomfort and interfere with both human activities and natural environments. Therefore, it is essential to regulate these negative effects within acceptable limits to ensure a sustainable and harmonious lighting ecosystem.
The report addresses the issue of light interference from four key perspectives: residential areas, traffic and logistics, landscape design, and astronomical observations. It categorizes environments into five levels, labeled E0 to E4, based on brightness. For each level, it provides specific photometric parameter limits tailored to different applications of outdoor lighting. These include:
- The vertical illumination limit for residential buildings
- The luminance limit of light sources within the field of view
- The brightness and threshold increment limits for road lighting
- The luminous flux ratio (ULR/UFR) for luminaires controlling sky glow
- The brightness limits for illuminated signs and buildings
With the rapid advancement of LED technology, LED displays have become increasingly common in outdoor settings. Their high brightness and potential flicker have raised concerns within the industry, prompting ongoing research into their impact on light interference.
Effective control of light pollution must be considered throughout the entire lifecycle of lighting systems—installation, operation, and maintenance. The report provides comprehensive recommendations on how to implement these controls effectively.
In addition to guidelines, the document also includes calculation and measurement methods for determining the relevant parameters. These measurements typically involve evaluating vertical illumination, luminaire light distribution, brightness of light curtains, and vertical plane brightness. A two-dimensional CCD-based Imaging Luminance Meter is recommended as the preferred tool for on-site brightness assessments.
A schematic diagram illustrates the typical light emission distribution of street lamps, showing the areas where lighting is required, the spread of light, and the potential for unwanted glare and interference.
This updated guide serves as an essential resource for professionals involved in urban planning, lighting design, and environmental protection, helping to promote responsible and sustainable use of outdoor lighting.
86 Inch Interactive Conference Board
86 Inch Interactive Conference Board,86 Inch Infrared Touch One Machine,Smart Education Integrated Blackboard,Multimedia Computer Integrated Machine
Jiangsu Qilong Electronic Technology Co., Ltd. , https://www.qilongtouch.com