Urban lighting and the overall image of the city, the night lighting environment, people's lives, etc. are closely related, if the lighting does not meet the standard, it will also cause light pollution, so for the city night lighting, there are detailed specifications.
In the urban night lighting specification, what are the requirements for lights?
1. Flood lighting: metal halide lamp or high-pressure sodium lamp should be used;
2. Internal light transmission lighting should use three-color straight tube fluorescent lamp, light-emitting diode (LED) or compact fluorescent lamp;
3. Contour lighting should use compact fluorescent lamps, cold cathode fluorescent lamps or light-emitting diodes (LEDs);
4. Commercial pedestrian streets, advertisements and other places with high requirements for color recognition should use metal halide lamps, three-color straight tube fluorescent lamps or other high color rendering light sources;
5. The lawn lights in the garden and square should use compact fluorescent lamps, light-emitting diodes (LEDs) or low-power metal halide lamps;
6. Self-illuminating advertisements and logos should use low-energy-consuming light-emitting sources such as light-emitting diodes (LEDs) and field-emitting films (EL);
7. It is generally not appropriate to use high-pressure mercury lamps, and self-ballast fluorescent high-pressure mercury lamps and ordinary lighting incandescent lamps should not be used.
The specific characteristics of the type of luminaire involved
1. Metal halide lamp: high luminous efficiency, good color rendering performance, long life
2. High-pressure sodium lamp: high luminous efficiency, less power consumption, long life, strong fog penetration ability and no rust and other characteristics.
3. Three-color straight tube fluorescent lamp: mostly use electronic ballast system, which has significant advantages in protecting vision and energy saving, so it is mostly used for internal transparent lighting and will not harm the eyes of indoor personnel.
4. Compact fluorescent lamp: recognized as the only suitable light source to replace incandescent lamps, and the more common types of lamps and lanterns in life and lighting projects.
5. Cold cathode fluorescent lamp: referred to as CCFL, with the advantages of high efficiency and high brightness,
6. Light-emitting diode (LED): with low energy consumption, can be high-speed switching state work, fast response, environmental protection and other characteristics, in addition to its cold light source lamps, summer will not attract flying insects.
In fact, the choice of lamps and lanterns in the urban night lighting specifications does not make very hard provisions, most of which are recommended requirements, so the lighting design can be flexibly selected, as long as it does not produce light pollution and meets the specifications of other aspects.