In order to further prevent outdoor lighting light pollution and ensure a good lighting environment, CIE recently released the second edition of "Guide on the Limitation of the Effects of Obtrusive Light from Outdoor Lighting Installations (2nd Edition)" (CIE 150: 2017), the technical report was revised on the basis of CIE 150: 2003, and the guidance methods for evaluating the environmental impact of outdoor lighting were given, and the optical interference limits and their measurement methods in different environments were recommended. At the same time, some remedial measures for existing outdoor lighting devices were also recommended in the report.
Outdoor lighting is widely used, and its main functions include ensuring people's night work (such as night logistics, sports events, etc.), security, beautification of landscapes, advertising and display. However, these outdoor lighting may also cause immediate interference in the environment, and often complain, so it is necessary to control these negative effects within a reasonable range.
The technology report analyzes the problem of light interference from four aspects: residential area, traffic logistics, landscaping and astronomical observation. According to the brightness, the report divides the environment from E0 to E4 into 5 intervals, and gives the photometric parameter limits for different environmental intervals under various outdoor lighting applications, including:
â— Vertical illumination (light intrusion) limit of the house
â— Luminance limit of the luminaire in the field of view
â— Light curtain brightness and threshold increment limits in road lighting
â— Luminous flux ratio (ULR/UFR) limits for luminaires that control skylight
â— Brightness limits in buildings and signs that are highlighted by strong light
With the rapid development of LED technology, LED outdoor displays are also more and more widely used. Their high brightness and flicker have been paid attention to by the industry. The light interference of LED display has been and is being studied continuously.
Control of light pollution must be considered in terms of actual, installation, operation and maintenance. The technical report on these aspects of light interference control measures is elaborated.
The calculation and measurement methods of the limit parameters are also given in the report. The measured parameters in the optical interference evaluation include vertical illumination, light intensity distribution of the luminaire, brightness of the light curtain at the illumination site, vertical plane brightness, etc., based on the two-dimensional CCD. The Imaging Luminance Meter is the recommended solution for measuring on-site brightness.
Schematic diagram of light emission distribution of typical street lamps
1- lighting requirements on the driveway;
2 - the light needed;
3-spray light;
4-Interference light.
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