City night lighting design specification full text download link:
Urban night lighting design specification
1 General
2 terms
3 Basic provisions 3.1 Principles of regulation
3.2 Selection of lighting source and its electrical accessories
3.3 Lighting fixture selection
4 Lighting evaluation indicators 4.1 Illuminance or brightness
4.2 Color
4.3 Uniformity, contrast and three-dimensionality
4.4 Limitation of glare
5 Lighting Design 5.1 Buildings 5.2 Structures and Special Landscape Elements 5.3 Commercial Pedestrian Street 5.4 Square 5.5 Park 5.6 Advertising and Logo
6 Lighting energy saving 6.1 Lighting energy saving measures 6.2 Lighting power density value (LPD)
7 Light pollution restrictions
8 Lighting Power Supply and Distribution and Safety 8.1 Lighting Power Supply and Distribution 8.2 Lighting Control 8.3 Safety Protection and Grounding Appendix A Division of Urban Scale and Environmental Area Appendix B Calculation, Measurement and Use of Semi-Cylinder Illumination Appendix C The division of the pool and fountain area is described in this specification.
Attachment: Article Description
2 terms
2.0.1 night landscape landscape in night, nightscape
At night, the landscape shaped by natural light and light, referred to as the night scene.
2.0.2 Night lighting nightscape lighting
Refers to the illumination of nighttime landscapes of all outdoor public event spaces or scenes, in addition to functional lighting such as stadium venues, construction sites and road lighting, also known as landscape lighting.
2.0.3 floodlighting floodlighting
A scene or target is usually illuminated by a floodlight to illuminate illumination that is significantly higher than the ambient illumination.
2.0.4 outline lighting, lighting lighting, contour lighting
Use lighting to directly map the lighting of the contours of the object being illuminated, such as buildings and structures.
2.0.5 light transmission inside lighting from interior lights
An illumination method that uses indoor light to transmit to the outside.
2.0.6 accent lighting
To increase the illumination of a particular area or target, to make it brighter than the surrounding area.
2.0.7 Dynamic lighting dynamic lighting
A lighting mode that changes the brightness, darkness, or color of the scene by controlling the light output of the lighting device.
2.0.8 luminaire efficiency luminaire efficiency
The ratio of the total luminous flux emitted by the luminaire to the total luminous flux from all sources within the luminaire under the same conditions of use.
2.0.9 Illuminance illuminance
The illuminance at a point on the surface is the quotient of the luminous flux dφ incident on the bin containing the point divided by the area of ​​the bin dA, that is, E=dφ/dA (2.0.9). The sign of the quantity is E, and the unit is lx. (lux), 1lx = 1lm/m2.
2.0.10 Brightness
The amount defined by dφ/(dA•cosθ•dω), that is, the luminous intensity per unit projected area, is expressed as: L = dφ / (dA • cos θ • dω) ( 2.0.10)
Where dφ is the luminous flux propagating by the beam element of the specified point in a solid angle dω containing the specified direction;
dA - including the beam cross-sectional area at a given point;
Θ—the angle between the normal of the beam section and the direction of the beam.
The amount is in accordance with L and the unit is cd/m2 (candela per square meter).
2.0.11 Glare glare
A visual phenomenon that causes an uncomfortable feeling or a reduced ability to observe a detail or target due to an unfavorable brightness distribution or a range of brightness in the field of view, or an extreme contrast.
2.0.12 threshold increment threshold increment
A measure of disability glare. Expressed as a percentage of the contrast between the object and the background for the purpose of seeing the same object when there is a glare source. The sign of this quantity is TI.
2.0.13 color temperature
When the chromaticity of the light source is the same as the chromaticity of the black body at a certain temperature, the absolute temperature of the black body is the color temperature of the light source. The sign of this quantity is Tc and the unit is K.
2.0.14 correlated color temperature (degree)
When the chromaticity point of the light source is not on the black body trajectory, and the chromaticity of the light source is closest to the chromaticity of the black body at a certain temperature, the absolute temperature of the black body is the correlated color temperature of the light source. The sign of this quantity is Tcp and the unit is K.
2.0.15 General color rendering index general colour rendering index
The average of the specific color rendering index of the eight standard color samples specified by the International Commission on Illumination (CIE). Known as the color rendering index. The sign of this quantity is Ra.
2.0.16 reflectance reflectance
The ratio of the reflected luminous flux to the incident luminous flux under the specified spectral composition, polarization state, and geometric distribution of the incident ray. The symbol is Ï.
2.0.17 brightness contrast
The ratio of the difference between the brightness of the object and the background in the field of view and the background brightness, ie C=(Lo-Lb)/Lb or C=ΔL/Lb (2.0.17)
Where C - brightness contrast;
Lo - identify the brightness of the object;
Lb - identifies the background brightness of the object;
ΔL - identifies the difference in brightness between the object and the background.
Positive comparison when Lo>Lb;
Negative contrast when Lo < Lb.
2.0.18 color contrast chromatic contrast,colour contrast
At the same time or successively observe the subjective evaluation of the color difference between two adjacent parts in the field of view. Color contrast is divided into hue contrast, brightness contrast and chroma contrast.
2.0.19 Illuminance or brightness uniformity uniformity of illuminance (luminance)
An amount indicating a change in illuminance or brightness on a prescribed plane, the sign of which is U.
There are two ways to express illuminance or brightness uniformity:
1) the ratio of the minimum illuminance or brightness to the maximum illuminance or brightness, the symbol is U1;
2) The ratio of minimum illumination or brightness to average illumination or brightness, symbol U2.
2.0.20 Average semi-cylindrical illumination average semi-cylindrical illuminance
The average illuminance produced by a light source on an imaginary half of a cylindrical surface at a given point in space. The cylinder axis is usually vertical. The sign of this quantity is Esc.
2.0.21 Three-dimensional sense
Use light to create a bright and dark contrast effect, showing the ability of the object's three-dimensional shape and surface texture.
2.0.22 Green lighting green lights
Saving resources, protecting the environment, and improving lighting, people's learning, work efficiency and quality of life, as well as ensuring physical and mental health.
2.0.23 Lighting power density (LPD) lighting power density
Lighting installation power per unit area (including light source, ballast or transformer, etc.) in watts per square meter (W/m2).
2.0.24 Light pollution
Refers to the general term for the negative effects of interference light or excessive light radiation (including visible light, ultraviolet and infrared radiation) on people, ecological environment and astronomical observations.
2.0.25 Spill light (spray light)
A portion of the light outside the range of the illuminated target is illuminated by the light emitted by the illumination device.
2.0.26 Interference light obtrusive light
Spilled light that causes discomfort, distraction, or decreased visual ability in a given situation due to the amount, direction, or spectral characteristics of the light.
2.0.27 upper light output ratio (ULOR) upward light output ratio
When the luminaire is installed in a specified design position, the ratio of the luminous flux emitted by the luminaire above the horizontal plane to the total luminous flux emitted by all of the luminaires in the luminaire.
2.0.28 Light-off period curfew
A relatively strict period of time is required to control the light pollution of the disturbing light.
2.0.29 environmental area
In order to limit light pollution, according to the environmental brightness status and the content of the activity, the division of the corresponding area.
2.0.30 maintenance factor maintenance factor
The ratio of the average illuminance or average brightness obtained on the specified surface of the illuminating device after a certain period of time on the specified surface after the device is used for a certain period of time.
2.0.31 Maintaining average illuminance (brightness) maintained average illuminance (luminance)
The average illuminance (brightness) value on the specified surface when the illuminator must be maintained.
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