Selection criteria for LED street light source and pole for different road grades

In the EMC project, the general government or the manufacturer will mention the implementation of the test section in the negotiation with the government. What are the selection requirements for the test section? How can we implement a test section that is qualified and satisfactory to the local government? Let's explore it here.

First, the test section should select typical road sections that are representative of the spacing, height, overhang, elevation and consistency of the light source.

1, spacing

The street light spacing should be as small as possible. The preferred spacing is no more than 40 meters. It is best to choose a road with a 35 meter pole distance. National Standard "CJJ45-2006 Urban Road Lighting Design Standard" Street Light Pitch Reference Value: The height of the light pole of the cut-off type lamp is about 3 times the distance. Select the straight road and do not choose the curve or intersection. The cantilever length of the luminaire should not exceed 1/4 of the installation height, and the elevation angle of the luminaire should not exceed 15°;

2, road width

The road width is preferably two-way four lanes (about 15 meters), and the road surface is flat and wide.

3, the height of the pole

The height of the pole is preferably 8-10 meters, and the second choice is no more than 12 meters (the pole height directly affects the angle of light emission, which affects the uniformity of illumination). The cantilever hole of the lamp is preferably ¢60mm in diameter.

National Road Standard Reference:

The relationship between the type and arrangement of light distribution of lamps and the installation height and spacing of lamps

Note: Weff is the effective width of the road (m)

Need to pay attention to the above table, here is the point. Since the country has a specification for the distribution of street lamps, there will be different lighting options for different lamps in different test sections.

For example: a large road is 18 meters wide, and the middle green belt is 2 meters two-way four lanes. How to judge the road as a test road section in the light pole and light distribution?

solution:

(1) Road qualitative main road

1, must use cut-off lamps

2. According to the above table, the distribution of the poles of this road is

(1) Double-sided staggered lamp: The height of the pole is more than 12 meters, and the distance between the poles is ≤ 36 meters, which meets the requirements of the national and test sections.

(2) Double-sided symmetrical cloth lights: the height of the pole is more than 9 meters, and the distance between the poles is ≤ 27 meters, which meets the requirements of the national and test sections.

(2) The road is characterized as the secondary road

1. It can be used for light-cut or half-cut type street lamps (such as the use of cut-off type street lamps and the above conditions)

2. If a half-cut type street light is used, according to the above, the lamp pole distribution of this road is

(1) Double-sided staggered lamp: The height of the pole is more than 14 meters, and the distance between the poles is ≤ 50 meters, which meets the requirements of the national and test sections.

(2) Double-sided symmetrical cloth lights: the height of the pole is more than 11 meters, and the distance between the poles is ≤ 39 meters, which meets the requirements of the national and test sections.

Conclusion: If you choose this section as the test section, then it is best to use LED cut-off type lamps, the best way to distribute light is TypeIIShort or Medium (please add, for the light distribution, please refer to the discussion about the light distribution of the lamps in my log. The basic formula when choosing the light distribution is: the height of the rod is H, the width of the road is W, and the quotient between them is equal to 1 to select Type I light distribution, less than 1 to 0.25 to select Type II, less than or equal to 0.25 to select Type III, and cast light The length is based on the width of the pole.

(3) Way of lighting

The conventional lighting method should be adopted, and the layout of the street lamp pole is called the best in both sides;

The order of selection of lighting methods:

Five basic ways of arranging conventional lighting fixtures

(a) one-sided arrangement; (b) double-sided staggered arrangement; (c) bilaterally symmetric arrangement; (d) centrally symmetric arrangement; (e) lateral suspension arrangement

(4) The replaced light source is preferably a high pressure sodium lamp: the higher the power of the light source, the better, the single lamp power is better at 400W or above, and the second is 250W or 150W.

(5) It is better to test the obstructions and shades on both sides of the roads , and not to hinder the normal lighting of the street lamps;

(6) It is better to choose secondary trunk roads or branch roads ;

(7) Selecting the road section with less external auxiliary light source , which can reflect the lighting effect of LED street lighting.

(8) Without any energy-saving devices , the voltage is relatively stable;

(9) Road sections with less traffic flow and less traffic and good road conditions

To sum up, with the government departments to do street lighting energy-saving renovation projects, we must first consider the energy-saving benefits of energy-using units as the primary consideration and strictly implement national standards. Secondly, it is necessary to reduce the investment risk of the energy service company and recover the investment income as soon as possible. The replacement principle of all luminaires must be based on these two points.

7 M Light Tower

7 M light tower