Design of lighting scheme for road lighting

The basic concept of a pavement road lighting <br> average luminance Lav: refers to the average luminance of each point on the road to be illuminated. The higher the average brightness, the higher the target visibility.

Luminance uniformity Uo: refers to the ratio of the minimum value to the average value when calculating the average brightness; the higher the uniformity, the better the recognition ability of the eye.

Lane uniformity UL: refers to the maximum and minimum brightness ratio along the centerline of each lane; the driver's attention to his own lane is very high, the average brightness of the road on each lane should be much higher than the whole road, and the lane is even The degree is high.

Glare TI: The brightness of the luminaire (glare source) on the eye, the angle of sight and the angle of the eye to the direction of the luminaire, the number of glare sources and the average brightness of the road. High glare can cause a loss of recognition and even a short period of blindness.

Environmental Factor SR: In order to make road users see the obstacles more clearly, they can walk more securely, and the surrounding environment of the road also has a certain brightness, which is related to the road surface brightness near the roadside.

Visual guidance: There are no calculation formulas, measuring instruments and quantitative standards, which is an empirical indicator. It mainly refers to the direction, line type and curvature of the road ahead to the driver through the arrangement of the lamps and the selection of the light source, so that the driver can react in advance and improve traffic safety.

2 road lighting solutions <br> design steps are as follows:

Determine road categories, lighting quality standards, luminaires and light sources, and layout;
Calculate the lighting indicators of the selected combinations; select the optimal solution;
To simplify and optimize road lighting design, you can learn from the following experiences:
(1) Lighting method: road width W≤light height h: single side cloth light; road width W=1~1.5h: staggered cloth light; road width W>1.5h: relative cloth light; building walls on both sides The street is very narrow: the hanging cloth in the middle, the light spacing is 10~20m. The road with the central isolation belt can be combined with the central double-picked lamp, the central double-picked lamp and the opposite cloth.

(2) Curves: For corners with a turning radius of <1000m, the road width and visual guidance must be considered. For all corners, the light is arranged on the outside of the curve when it is unilaterally arranged, and it has better visual guidance than on the inside; for the wider curve, the relative illumination of the lamp is better than that of the staggered lamp. Sex.

In general, the luminaires are arranged 0.7 times the distance between the lights on the outside of the curve and 0.55 times on the inside. The smaller the turning radius, the smaller the lamp spacing must be. The pole is arranged outside the curve, although it can improve the guiding property, but it is more likely to be collided by the motor vehicle, so it is sometimes arranged on the inner side.

(3) Conflict zone: At intersections, roundabouts, and up and down ramps, streetlights need to help prevent traffic jams and help drivers identify the correct exits. The general design principle is: let the intersection have a higher brightness level; let the main secondary roads have different lighting patterns. For intersections with large areas and long distances such as intersections and overpasses, ordinary street lighting often fails to meet the lighting standards. Therefore, 12~18 meters of central pole floodlights are often used as supplementary lighting to improve the brightness of intersections. For more complex intersections or some cross-sections of cross-sections, high-beam lights of more than 20m are often used for area illumination.

(4) Installation of lamps: According to the road width, the main street is generally used with 250W~400W lamps, and the lamp height is 7~12m. The general road uses 150W~250W lamps, and the lamp height is 6~8m. The higher the lamp height, the smaller the glare, the better the brightness uniformity, the wider the lamp spacing, but the higher the lamp height will reduce the light utilization. The lamp spacing is generally 30~50m.

Lamp distance / lamp height (L / H), road width / lamp height (B / H) recommended value (ratio can be expanded by 20% as appropriate) cloth light form single side cloth center cloth light relative to the lamp staggered cloth light L / H 5 5 5 7
B/H 1.5 2.5 4 2.5
For large-scale places such as city interchanges, stations, terminals, airports, plazas, etc., high pole lighting should be considered, and the ratio of spacing to height is preferably 4:1 to 3:1.

3 Conclusion
The design of the road lighting lighting scheme should select the appropriate lighting form, lamp height and lamp spacing according to the type and width of the road to meet the functional requirements of road lighting and achieve good lighting effects.

[1] Tang Hai editor. Building electrical design and construction [M]. China Building Industry Press, 2000, (9): 645-650.

About the author: Liu Jinghua (1980-), female, Shandong Heze, bachelor, assistant engineer, main research direction building electrical design; Sun Fujie (1979-), female, Shandong Zhucheng people, bachelor, assistant engineer, main research direction building electrical design ; Haibo (1979-), male, Shandong Qixia, bachelor, assistant engineer, the main research direction of power materials procurement, general contracting project material management.

Edit: Sophy

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