First of all, if the road is 20 meters wide, it should be considered a main road, so it needs to be lit on both sides. In addition, the lighting requirements of the road mainly include illumination requirements and illumination uniformity. The uniformity should generally be above 0.3. The greater the uniformity, the more scattered the light of the solar street lamp is, and the better the lighting effect.

Therefore, we can assume that it is a double-row symmetrical lighting arrangement, and the height of the street lamp pole is at least greater than 1/2 of the road width, so the height of the pole should be 12-14 meters; assuming a 14-meter pole, the installation spacing of the street lamp is generally about 3 times the height of the pole, so the spacing is at least 40 meters; assuming that the solar street lamp has a spacing of 40 meters and the pole height is 14 meters, the power of the solar street lamp in this case must be above 200W to basically meet the lighting requirements of the main road.

Secondly, illumination and power are related to the installation height of the lamp. For solar street lights, we hope that the angle of illumination is as large as possible, so that the uniformity will be good, and the distance between the lamp poles can be widened, the number of lamp poles installed can be reduced, and the cost can be saved.

Finally, if the solar smart street lights have a distance of 40 meters, the height of the street light poles is 14 meters, the power is 200W, and the lights are arranged on both sides, how is the illumination calculated? Therefore, it is necessary to test the 200W street lights first, because street lights from different manufacturers use different LEDs, and the light distribution lenses are also different, and the total luminous flux of the same power will also be different, which will lead to different illumination on the road surface.