Why is the LED street light road darker?

Weiguo Road has been replaced with LED street lights. Netizens report that LED street lights will make the road surface darker and affect traffic safety.

    After undertaking the "Guangdong Province LED Energy-saving Street Lamps and Lighting Project Pilot Area Construction Project" this year, Foshan Chancheng District proposed to transform more than 57,000 traditional street lamps into LED street lights within 3 years. At present, relevant departments have completed Lakeview Road, Lvjing Road, Heyuan Road, Rainbow Road, Foshan Avenue Zhangye Tunnel, Wenhua Road, Tongji East, Qijiang South Road, Lingnan Avenue (short light), Shenning Road, Wufeng Street lights conversion work in four roads, Dongping Road and Weiguo Road, and the main street lights of Jihua Road, Lingnan Avenue (highlights), Jiangwan Road, Huayang Road (Nanhai Avenue Chancheng Section) are also replaced this year. Will be completed. Due to the large scale, the speed, and the controversy of the effect, in recent days, the problem of changing lights has caused strong social concern, and the praises are different. In response to public debates and doubts, yesterday, Chancheng District Public Utilities Bureau met with the media to answer questions from citizens. And said that this year's street lamp replacement plan will be carried out as scheduled.

Is it a saving or a waste of focus?

  The public questioned:

    Netizen Zhang Wenyuan said, "Support for the replacement of energy-saving LEDs, but it is best for the government to announce cost and cost-effectiveness ratio," because "a 400W LED lamp costs more than twice as much as a high-pressure sodium lamp, even if it takes a long time to save power. What is the difference in cost?"

   Department answer:

    The person in charge of the public department of the Public Utilities Bureau of Chancheng District yesterday compared LED street lamps and high-pressure sodium lamps in terms of lamp cost, power consumption, life, and maintenance cost.

    Take Weiguo Road as an example. The original high-pressure sodium lamp has a power of 400W, the lamp cost is 1,500 yuan, and the 168W LED street lamp is used after replacement. The cost of the lamp is 4,000 yuan, and the investment is increased to 2,500 yuan. It has been replaced in Chancheng. Among the street lamps, according to the monitoring, the power saving efficiency is above 55%. The daily lighting is measured in 11 hours, and the non-industrial electricity price is 0.85 yuan/kWh. Before using a high-pressure sodium lamp 400W, the annual electricity cost (increasing the power consumption of the ballast) is: 0.45 (kw) × 365 (天) × 11 (hours) × 0.85 (yuan) = 1535.7 yuan, using LED light source lamps to save annual electricity costs: 1535.7 yuan × 55% = 844.7 yuan. The cost of saving electricity can save the cost of investing in just three years. "Because of the long life of LED street lamps, it is not necessary to replace them within 5 years. The maintenance cost is zero within 5 years and the high-pressure sodium lamps need to be replaced 2 to 4 times within five years. The purchase of light source and replacement fee will increase the cost of high-pressure sodium lamps." National Road has replaced 116 盏 LED street lights to calculate, saving 98,000 yuan in electricity a year. After all 57,000 盏 high-pressure sodium lamps are changed to LEDs, the annual electricity savings will be as high as 46.13 million yuan.

    In addition, the replacement of high-pressure sodium lamps will not be wasted, and will be applied to the black point reconstruction of suburban sections.

    Focus 2, change the money to pay taxpayers?

    The public questioned:

    Some netizens have also changed the lamp for a large area in Chancheng. It costs a lot. "If it is financed by the government, it is the taxpayer's money. Should it be comprehensively measured, is there a need to change the lamp?"

  Department answer:

    The relevant person in charge of the Public Utilities Bureau of Chancheng District stated that the project is one of the major science and technology projects for energy conservation and emission reduction in Guangdong Province, and is also an important measure for Chancheng District to build a national green lighting city. During the year, Chancheng will complete the transformation of about 11,000 high-pressure sodium lamps in the whole district. The project will cost 54 million yuan. At present, the project has received nearly 10 million support funds from the provincial science and technology department and a small amount of government investment. Mainly invested in business.

    In order to break through the bottleneck of large and high-risk funds for LED streetlight demonstration projects, Chancheng explored a new model of contract energy management, and actively explored the contract energy management technology of "user + enterprise + bank" through joint energy-saving renovation service companies, enterprises and banks. Promote the new model ("EMC" mode).

    In the "EMC" model, banks provide energy-saving retrofit funds, and companies repay bank loans through green lighting energy-saving gains and share energy-saving benefits with the government. Once the promotion model is fully implemented in Chancheng, the government can introduce new LED technologies and products without investing or investing a small amount of money in the demonstration city of green energy-saving lighting, avoiding the technical and financial aspects that may be encountered by the project alone. Many risks.

Why is the road surface darker after the focus is changed?

  The public questioned:

    Netizen hebi said that he lived near Lvjing Road and drove through the feeling that the LED would make the asphalt road darker. Sometimes he couldn't even see the pedestrians on the road, and then catch up with the rain and fog. The LED is more prominent. The government should take the lead in energy saving. However, these have affected road safety. Do you know if the government has investigated it?

   Department answer:

    "This may be a problem of lighting adaptation. Another is that the power of LED street lights currently installed in Lvjing Road is not enough." The relevant person in charge of the Public Utilities Bureau of the Chancheng District Public Utilities Bureau said that according to the normal principle, the color rendering index of white light High, originally able to improve road visibility, can play a more important role in the field of video surveillance, can effectively reduce the occurrence of traffic accidents and criminal cases, and improve the sense of security of the public. And the LED street lamp has a high color rendering index, which restores the original color of the object, so the road appears darker. The original yellow high-pressure sodium lamp, which made the asphalt road orange, so it was conspicuous. This is the problem of adapting to light. However, according to the feedback from netizens, the bureau will consider replacing the LED with more power in Lvjing Road to solve the problem of insufficient light in the road section.

   Insiders' view: technology is not mature and should not be promoted in large areas

    Zhou Zhaopeng (Head of large-scale engineering project of Foshan Electrical and Lighting Co., Ltd.): LED street lamps can save 50%~60% energy compared with traditional high-pressure sodium lamps. At the same time, the color rendering is better, making the road look brighter and more comfortable. Also feel safer.

    However, LED technology is currently immature and not suitable for large-scale promotion. First of all, although some LED companies claim that the product warranty period is 5 or 6 years, there is actually no sufficient data to prove. Moreover, the use environment of urban street lamps is very harsh. Dust, ash, bird droppings, leaves, etc. will hinder the heat dissipation of street lamps, and it is easy to burn out devices such as diodes and starters. However, the current technology has not completely solved this problem, so LEDs The warranty period of street lamps cannot be 5 or 6 years old.

Secondly, the heat dissipation problem of the LED street lamp is not well solved, and the light decay is large, thereby reducing the luminous efficiency, and may even drop to 30%. This means that the street lights that now look very bright will fade after a year and a half. If the light effect is increased by increasing the voltage and current, the LED chip is easily damaged. Finally, the LED is a unidirectional light source that is prone to light dead spots.

    And the LED lights are white, which means that in foggy and rainy days, the road becomes a piece of white flowers, affecting the vision. All in all, LED street lights are indeed the direction of future development, but they cannot be rushed. At present, they are not suitable for large-scale promotion, but should be gradually promoted. (Foshan Daily reporter He Bobo, Liao Wuzhi correspondent Zheng Suihua)

   Reporter's note: Can people's livelihood projects listen to public opinion first?

    Recently, the large-scale replacement of road lights in Chancheng District has caused strong social repercussions. This energy-saving "people's livelihood project" has caused many criticisms. Although the public has been boiling, the relevant units continue to explain the purpose and role of the replacement of lights through the media, but the debate has not stopped.

    Aside from the large-scale replacement of street lights, there are more people who have lost or lost. The netizens questioned whether it makes sense and the relevant departments to answer whether the citizens are satisfied or not. This debate makes people think about a problem. When citizens are paying more and more attention to government behaviors that are closely related to their own interests, and actively monitoring government behavior today, can the administrative thinking of relevant government departments keep up with the demands of the masses?

    Imagine that if the street lamp is replaced, the government can listen to the opinions of the masses, calculate the gains and losses for the masses, or select some road sections to pilot first, and find out the advantages and disadvantages of the high-pressure sodium lamps and LED street lamps. Then, whether the overall trade-offs will be comprehensively promoted, perhaps the public will Easy to accept. After sitting down with the public opinion, why not take the initiative to attack? When the public opinion in the whole society has come to implement the public relations policy, not only the administrative costs are increased, but also it is difficult to take the initiative.

    It is the way of public relations to take the initiative to listen to the public opinion and face the people's feelings. The management thinking of "big government and small society" has not adapted to the needs of the times. Can relevant government departments change their thinking and communicate with the public early when implementing policies involving public interest, which will not only eliminate unnecessary misunderstandings, but also Winning the trust and prestige of the citizens also reflects the government's mind.

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