I. How to choose lamps for road lighting
Road lightingThe quality depends on:
1. Brightness of road lighting. That is, there is enough strength to ensure that vehicle drivers and pedestrians can see obstacles on the road, pedestrians, vehicles and the situation around the road.
2. The uniformity of road lighting. That is, the distribution should be roughly uniform.
3. The degree of glare interference. That is, to effectively control the harmful effects of glare on vehicle drivers and pedestrians.
4. The guidance of lighting. That is, appropriate settings are made according to road conditions, so that vehicle drivers and pedestrians can effectively obtain information such as the direction and inclination of the road ahead, which is particularly important for roads with many curves and intersections. Reasonable application of lamps and lanterns can prevent glare.
Common lamps:
The lamps used for road lighting include high pressure sodium lamps, low pressure sodium lamps, electrodeless lamps, metal halide lamps , fluorescent lamps, new Somming xenon street lamps, etc. Incandescent lamps, high-pressure mercury lamps, and low-pressure sodium lamps have been gradually eliminated due to the performance defects of light sources. Illuminators should use light energy reasonably to prevent glare. The light emitted by the illuminator should be irradiated along the required angle and fall on the road surface in a designated pattern. The light distribution is uniform, the road surface brightness is large, and the glare is small. To reduce glare, the light distribution can be controlled above the maximum light intensity.
Second, road lighting device selection
lightsourceselection Select
The choice of light source should meet the following requirements:
1. High-pressure sodium lamps should be used for expressways, main roads, secondary roads and branch roads;
2. High-pressure sodium lamps or low-power metal halide lamps should be used for mixed traffic roads of motor vehicles and pedestrians in residential areas; Metal halide lamps can be used on high motor vehicle traffic roads;
4. Pedestrian streets in commercial areas, pedestrian roads in residential areas, and sidewalks on both sides of motor vehicle traffic roads can use low-power metal halide lamps and thin tube diameters. Fluorescent or compact fluorescent lamps.
Self-ballasted high-pressure mercury lamps and incandescent lamps should not be used for road lighting.
Selection of outdoor lighting fixtures and accessories
Motor vehicle lane lighting should use functional fixtures that meet the following requirements:
1 , Expressway, and main road must use light-cut or half-cut type lamps;
2. Secondary trunk roads should use half-cut type lamps;
3. Branch roads should use half-cut lamps Light fixtures.
Pedestrian streets, sidewalks, sidewalks, pedestrian bridges, and non-motorized vehicle lanes that need to be individually lit should use lamps that combine functionality and decoration. When decorative lamps are used, the upper luminous flux ratio should not be greater than 25%, and the mechanical strength should comply with the current national standard “General Safety Requirements and Experiments for Lamps” GB7000.1.
When using high pole lighting, you should choose floodlights or cut-off lamps with suitable power and light distribution according to the characteristics of the place.
When using closed road lighting fixtures, the protection level of the light source cavity should not be lower than IP54. For roads and places with serious environmental pollution and difficult maintenance, the protection level of the light source cavity should not be lower than IP65. The protection level of the electrical cavity of the lamp should not be lower than IP43.
Lamps with good corrosion resistance should be used in areas or places with high content of corrosive gases such as acid and alkali in the air.
For places prone to strong vibration, such as large bridges passing through motor vehicles, the lamps used should meet the anti-vibration requirements specified in the current national standard “General Safety Requirements and Experiments for Lamps” GB7000.1.
High-intensity gas discharge lamps should be equipped with energy-saving magnetic ballasts, and light sources with lower power can be equipped with electronic ballasts.
The installation distance between the trigger, ballast and light source of the high-intensity gas discharge lamp should meet the requirements of the product.
