Li Kai, deputy secretary general of Henan Lighting Association
As a high-speed regional center city, Zhengzhou City's urban lighting is highly valued. This spring, the municipal party committee member and deputy mayor Mu Weimin led the relevant leaders of various districts in the city to inspect Zhongyuan Road and Erqiguang to taste the Zijing Mountain and the garden. Road lighting conditions such as roads, Zhengdong New District, Jinshui Road and other urban main roads and urban night lighting work have made many important instructions, providing a good idea for urban lighting in Zhengzhou. Urban lighting during the Beijing Olympics provided a better reference for urban lighting in Zhengzhou. Recently, the reporter interviewed Li Kai, deputy secretary-general of the Henan Provincial Lighting Society, and gave a detailed understanding of the road lighting situation in Zhengzhou. According to reports, the current urban road lighting in Zhengzhou City is mainly composed of several parts, high-voltage power supply system, functional road lighting system, monitoring system.
Functional road lighting system
The conventional road lighting in Zhengzhou City has undergone large-scale reconstruction and construction since 2001. At present, it has reached a scale of 80,000 baht, which basically reaches the full coverage of the built-up area. In the construction process, the following principles are followed: the roads above 20 meters wide are equipped with double row lights, the roads below 20 meters wide are equipped with single row lights, the roads with widths over 5 meters are equipped with street lights, the average gear distance is less than 35 meters, the height of the poles 8 meters to 12 meters, generally equipped with 250W or 400W sodium light source, cut-off type lamps, power supply radius does not exceed 600 meters, three-phase four-wire power supply, line pipe laying, each pole is equipped with a special wiring well. These measures can basically meet the illumination and uniformity requirements of road lighting. According to our field test of some main roads and general roads, the illuminance indicators have reached the national standard. The uniformity index is quite different, and the main road performs well, but the general road is limited to the gear distance and the tree factor, and the performance is poor. Excluding unchangeable objective factors, such as tree occlusion, span limit, etc., an important reason for affecting uniformity is that the light distribution curve of the luminaire is unreasonable, especially some low-grade luminaires, which are seriously inconsistent with the light distribution introduced by the luminaire sample, resulting in The indicators are extremely poor. Low-grade luminaires should be avoided on main roads and general roads. Especially for some unique lamps, according to our survey, the unique shape of the lamps can not greatly help the urban landscape. No one in the industry notices that the shapes of the two adjacent main road lamps are different. There is a direct evaluation of the brightness. In particular, it is very important to provide functional lighting for wide sidewalks. The sudden turn into the carriageway from the sidewalk is an important cause of traffic accidents. If the brightness of the sidewalk and the carriageway are the same, it will greatly improve the driver's predictability and increase of pedestrian behavior. The emergency disposal time greatly reduces the accident rate and the intensity of the accident. The 250W sodium light source is the most stable light source with the highest light efficiency and the lowest maintenance rate, accounting for more than 95% of the dosage.
Energy-efficient lighting products
Due to peripheral devices, the stability, longevity, illumination (weighting) and uniformity (weighting) of the entire LED street lamp we tested in the field are inferior to conventional sodium lamp products. Therefore, LED products are not recommended for functional lighting applications. In terms of solar street lamps, this problem is also faced. Moreover, the lead-acid batteries that are commonly used nowadays are far from green and environmentally friendly from production to recycling. The maintenance of peripheral devices such as inverters, transformers, and photovoltaic cells cannot be underestimated. Therefore, the functional lighting of solar street lamps is only recommended for areas where the cost of power supply is high, lighting requirements are not high, and the range is small. Substation-side step-down energy-saving equipment is currently tried in many cities. Because the road lighting system load is relatively stable, the theoretical success rate should be relatively high, but in fact, many urban road lighting lines are often too long, and the terminal voltage is not up to standard. The adjustment accuracy of such energy-saving equipment is not high enough. At present, it is impossible to feedback the stable voltage in real time. Therefore, it is far from practical requirements, and the worse is to obtain better energy-saving data, forcibly lower the voltage and cause the end. The street light does not start properly and even damages the device such as the trigger. There is still a long way to go before such devices can realize energy-saving applications for large-scale road lighting. Energy conservation and emission reduction must be pragmatic, and we must not pursue new developments and science. In fact, in the field of road lighting, there are many good ways to achieve energy saving and emission reduction. For example, the monitoring system is used to realize the switching lights at sunrise and sunrise. According to calculations, energy saving is 10%-20%. Install capacitors to increase power factor and save 30% energy. Midnight light control (this method will greatly reduce the uniformity) can save 50% energy. With a dual voltage ballast, it can save 30% energy. A light source with some special wavelength light (the most sensitive wavelength segment of human vision) can save 30% energy. These energy-saving methods are mature commercial products, do not cause damage to peripheral equipment, or have detailed experimental data to support, and the relative investment amount is not higher than some popular concept hype products.
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