LED street light replaces the advantages of traditional street lights
February 13, 2023
LED street light replacement high pressure sodium light
Recently, Chancheng began to transform the street lights in the area and replaced them with more green and energy-saving LED street lights. According to the plan, Chancheng will complete the transformation of about 11,000 high-pressure sodium lamps in the whole district during the year, and in the next three years, it will replace 57,000 LED street lamps, and strive to create a green lighting demonstration city in the province.
However, after the completion of the replacement of LED street lights in the sections such as Hujing Road, Lvjing Road and Jihua Second Road, some citizens have had a great controversy about the lighting effect of LED street lamps. The netizen "Zhengtai Leon" recently posted a message on the local famous forum C2000. "LED is more energy-efficient, but the cost is very expensive. It is wasteful and costly to replace the original lamp. The most important thing is that the current LED lights are very ugly cities." He called, "LED is too pale, for the beautification of the city, please do not replace the LED lights on a large scale."
After the post was issued, it attracted nearly 100,000 hits from netizens, and more than 100 netizens spoke and expressed their opinions. Among them, some netizens support the government's measures to replace LED street lights, but more netizens have doubts about replacing LED street lights. The netizen "lishhui" is based on "about Foshan's current large-scale replacement of LED lights", with detailed data. From the aspects of cost, performance and effect of LED street lamps, it is not appropriate to demonstrate the current large-scale replacement of LED street lamps.
In this regard, the relevant project leaders of the Chancheng District Public Utilities Bureau answered various questions one by one, and said that the public pays attention to this matter. This is a good thing, and the government also replaces LED street lights and advocates “all people participate in energy conservation and emission reduction. "A goal."
"We will attach great importance to the opinions and suggestions put forward by the public, and discuss the research at work. Good suggestions will be adopted." The person in charge said that if the public has any opinions or suggestions on LED street lights, they can call the city. Lighting Management Center 24-hour hotline.
LED street light white light ugly city?
The person in charge of the relevant project of Chancheng District Public Utilities Bureau explained: The feeling of white LED street lights is different, and everyone's preferences and feelings are different. But in general, white light is close to the sun, the color rendering index is high, and the lighting effect will be better. The public's evaluation of "night as white" is the best proof. When people started using fluorescent tubes, many people were not used to using white light, but now basically no one will object. "The so-called horror is caused by the mandatory habits of human beings. The current color is closer to the sun, and enjoying the sunshine close to the day at night is a progressive choice."
In addition, yellow LED lights are achievable, but the luminous efficiency is significantly reduced, about 80% of white light. "In fact, the original yellow light illumination is determined by the principle of the high-pressure sodium lamp. If the white light is originally emitted, it will be controversial to switch to yellow light today."
LED street lights are too expensive, and large-scale replacement causes financial waste?
It is understood that with the development of the industry, the scale effect and the change of market supply and demand ratio, the cost of LED street lamps has dropped from the initial 8,000 to 9,000 yuan to about 4,000 yuan. The price of LED street lights replaced by Chancheng is around 4,000 yuan. According to the current production cost of LED, this price is the closest to the cost price.
The person in charge said that the price of the lamps cannot be simply added or subtracted. LED street lamps have a lifespan of 50,000 hours, while metal halide lamps have a lifetime of 6000 to 12,000 hours. If you use 1 year as the unit of calculation, the cost will definitely increase. However, in the past five years, electricity costs, lamp losses, etc. are much lower than the street lamps currently in use, so in the long run, the cost is reduced. And in 5 years, the high-pressure sodium lamp needs to be replaced 2 or 4 times, not counting the daily maintenance, but the cost per replacement is very high. The warranty period of the LED lamp supplier is 5 years. If the lamp has a problem within 5 years, it can be replaced free of charge.
In addition, the replacement of LED street lights in Chancheng is based on the successful experience of developed countries, and adopts the “user + enterprise + bank” contract energy management technology to 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 savings and share energy savings with the government. With the application of this model, the government can introduce new LED technologies and products without investing or investing a small amount of money, avoiding the risks of technical and financial aspects that may be encountered by the project alone.
After the replacement, the lighting effect has not improved much or even decreased?
According to reports, the LED street light source is small in size, and it is easier to achieve the actual lighting needs of the light distribution. The illumination is uniform, avoiding the difference of the spot is easy to cause fatigue for pedestrians and drivers, and the indicators such as illumination uniformity are improved. The person in charge pointed out that the lighting can be realized with the original light pole no longer investing in new funds, and the LED lamp has better adaptability from another aspect, and is more suitable for road lighting in the long run. Moreover, the existing LED street lamps are designed and manufactured according to the current pole height and layout, and there is no overall decline in lighting quality.
In addition, from the government's sample survey of the public, the public generally reflected that the road lighting conditions have been improved, Lingnan Avenue, Weiguo Road, Shidong Shanglu Road, Wenhua Road, Hujing Road, Kuiqi Road, Minjiang South Road, etc. Shops and pedestrians along the city's main roads say that the effect is much better than before, and the number of pedestrians at night is significantly higher than before. Replacing street lights has many benefits for the public. First, the lights are clear and the visible distance at night increases, which can reduce the occurrence of car accidents. At the same time, the monitoring of each road section is clearer, avoiding the occurrence of cases such as theft and grabbing.
The technology is immature and not suitable for large-scale use?
According to the person in charge, the use of high-power LEDs for road lighting began with tunnel lighting on highways and has been in use for more than two years. Since the successful installation of LED street lights in June 2008, the actual use has been more than one year. Currently used LED street lamps, manufacturers through accelerated aging test, and national testing institutions test and measurement, 5000 hours of light decay rate of less than 3%, it is concluded that the light decay to 70% requires 50,000 hours. This data has been proven in more than a year of practice, and LED lights have matured as road lighting.
This year, the Ministry of Science and Technology launched the “Ten Cities and Ten Thousands” LED streetlight application project, which was included in more than 20 cities across the country, including Dongguan and Shenzhen in Guangdong. The basic condition for the city to be selected is that a certain number of LED street lights must have been installed before. For example, the two towns of Shilong and Shipai in Dongguan are currently installed for about 10,000 baht, and Guangzhou has replaced LED street lights in the south and north of the main road, Guangzhou Avenue, and claimed to replace 180,000 in the urban area within 3 years. Neon light.
Does the digital argument use LED street lights really not worthwhile?
Lamp cost comparison
Netizen "lishhui" according to the market price, 1W LED lamp 40 yuan, 200W is 200 ??? 40 = 8000 yuan; ordinary 250W high pressure sodium lamp lamps price about 1500 yuan. The annual electricity fee per 250W high-pressure sodium lamp is: 0.275 (kw) ??? 365 (days) ??? 11 (hours) ??? 0.5 (yuan) = 552 yuan, using LED light source lamps to save electricity costs: 552 yuan?? ?20%=110 yuan. Increased investment in LED light source lamps: 8,000 yuan - 1,500 yuan = 6,500 yuan, about 65.00/110 = 60 (years) to recover the investment. It can be seen that the current use of LED street lights is not cost-effective in terms of economics.
Public Utilities Bureau: 1WLED40 yuan, 120W is 120???40=4800 yuan; ordinary 250W high-pressure sodium lamp lamps cost about 1500 yuan. The annual electricity cost per 250W high-pressure sodium lamp is: 0.275 (kw) 365 (days) ??? 11 (hours) ??? 0.85 (yuan) = 938.5 yuan, using LED light source lamps to save annual electricity costs: 938.5 yuan? ?? 55% = 516.2 yuan. Increased investment in LED light source lamps: 4,800 yuan - 1,500 yuan = 3,300 yuan. Because LED lamps have a long life, they can also save daily maintenance costs. Therefore, after replacing LED lamps, the actual increase in investment is less than 3,300 yuan. In this way, it takes about 3300/516.2=6.4 (years) to recover the investment.
In addition, the LED can be replaced in 5 years, and the high-pressure sodium lamp needs to be replaced 2 to 4 times. The purchase of the light source and the replacement fee will also increase the cost of the high-pressure sodium lamp. Therefore, the current use of LED from the economic point of view, 5 years or so can recover the cost.
Comparison of light source utilization
Netizen "lishhui" we may wish to use 90WLED (80lm / W) light source and 250W high pressure sodium lamp (110lm / W) for analysis, according to the effective utilization of lamps, 250W high pressure sodium lamp effective light output should be 250???110? ?75%??? 60%=12375lm, and the effective total luminous flux of the 90W LED light source is 90???80??? 75%=5400lm. Obviously, the two are very different and cannot be replaced. If compared to each other under the same conditions, to meet the 12375lm luminous flux requirements, the power of the LED light source should be 12375/60=200W, energy saving 20%.
Public Utilities Bureau: According to the current LED street light, 120WLED (90lm/W) light source and 250W high pressure sodium lamp (110lm/W) are needed for analysis. According to the effective utilization rate of the lamp, the total effective light output of the 250W high pressure sodium lamp should be 250?? 110?75%???60%=12375lm, but the total amount of effective light output is that the light source emits light in all directions. For passers-by, the illumination of the upper part of the light source is invalid and should be multiplied by a reasonable coefficient. To consider the power consumption of street lamp ballast and other factors, according to the above algorithm, the total effective light output is 250 ??? 110 ??? 75% ??? 60% = 12375 lm, ground effective light 12375 lm ??? 65% = 8044 lm . The LED is single-sided illumination, and the effective light is all within one beam angle. The effective total luminous flux of the 120W LED light source is 120 ??? 90 ??? 75% = 8100 lm, and energy saving is 52%. If the person in the middle of the night and the car are few, the LED street light can reduce the brightness regularly to achieve energy saving again, so saving 60% is completely no problem. (Edit: Looking up at the stars)
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