LED street lamps have been promoted for a long time. Even if they are not widely used now, LED street lamps will certainly be the faithful guardians of the road in the future. However, in view of the various problems in the current application process, how the LED street lamp project is after-sales and how it is after-sales has become a concern of more people. Generally speaking, in order to enable the enterprise to better fulfill its after-sales service responsibilities, the street lamp management department will divide the project funds into three payments to the enterprise, I . e. advance payment, post-installation and post-warranty balance, the ratio is about 3:5: 2. For enterprises, whether it is to fulfill the terms of the contract or to recover the full amount, after-sales maintenance is a part that must be of great concern. According to the reporter's understanding, many enterprises said that the frequent failure of LED street lamps is still the power supply, with a proportion as high as 80. At present, the waterproof and dustproof products of most regular street lamp enterprises can reach IP65, and some can even reach IP68. the light source is basically not bad. Yang Hongtao, project director of Beijing Chengtong Optoelectronics Co. , Ltd. , said. It is reported that LED street lamps need to convert the high voltage of mains power into low voltage through the driving power supply to work, and this link has a great test on the performance of the power supply, such as poor heat dissipation treatment, when used in extremely cold areas with low temperature environment or running for a long time, the power supply may fail, so the stability of the power supply needs to be improved. Xiao Zhiyong, vice president of BYD sales, said. However, some insiders pointed out that compared with light source devices, domestic enterprises actually have the ability to do a good job in power supply. The key is that the cost cannot be compressed too much, and good quality devices should be selected. Usually, when a street lamp fails, the enterprise needs to detect it first to troubleshoot various faults. If the driving power supply fails, the power supply needs to be removed, send it back to the power supply company. It is reported that the budget amount of the enterprise's LED street lamp repair cost is about 2 of the project cost, but for some products with poor quality, the repair cost may reach 5. This kind of installation and disassembly cost is very high, which will impose a heavy burden on street lamp enterprises. If the quantity is large, it will even drag down an enterprise, so the quality of power supply is very critical. An engineer with many years of experience in driving power research and development said frankly.