Common pitfalls and precautions of the hottest LED

  • Detail

Common pitfalls and precautions in LED street lamp procurement

LED street lamps have gradually eliminated traditional street lamps and become the "main force" of road lighting due to their characteristics of low power consumption, high luminous efficiency, long service life, energy conservation and environmental protection. The lighting time of street lamps is long, and they are installed outdoors, causing sun and rain. Therefore, the quality requirements of lamps must be passed. Otherwise, the lamps will be damaged, which will pose a threat to road safety. Therefore, no matter enterprises, institutions or engineering companies, they need to be careful when purchasing street lamps to avoid falling into the procurement trap

street lamp procurement needs to pay attention to the following traps:

trap fake chip, low-end chip

the core of LED lamps is the chip, which directly determines the sex of lamps. Ant EQ1 is the first small pure electric vehicle based on the super lightweight technology platform of all aluminum space architecture + all composite outer panels! However, some bad manufacturers take advantage of the unprofessional nature of their customers and, considering the cost, use low-cost chips, so that customers can buy low-quality products with high unit prices, causing direct economic losses and serious quality risks to LED lamps

trap 2 configuration false standard and exaggeration of configuration parameters

the popularity of solar street lamps is also accompanied by the reduction of price and profit. The fierce competition has also led to many solar street lamp manufacturers starting to steal work and materials and falsely mark product parameters. The wattage of light sources, the wattage of solar panels, battery capacity, and even the materials used for solar street lamp poles are all in trouble. Of course, this is also caused by customers' repeated price comparisons and requests for low prices, which is also related to the practices of some manufacturers

trap 3: poor heat dissipation design and unreasonable configuration

in terms of heat dissipation design, the life of semiconductor devices will decrease exponentially every time the PN junction temperature of LED chip increases by 10 degrees. Due to the high brightness requirements of LED solar street lamps and the harsh use environment, if the heat dissipation is not solved well, it will quickly lead to LED aging and reduced stability. In addition, unreasonable configuration often leads to the specific use situation not reaching the expected value

trap four copper wire passing off as gold wire and controller problem

many LED manufacturers try to develop copper alloy, gold clad silver alloy wire, silver alloy wire to replace expensive gold wire. Although these alternatives are better than gold wire in some characteristics, they are much worse in chemical stability. For example, silver wire and gold-clad silver alloy wire are vulnerable to sulfur/chlorine/bromination corrosion, but the financial and policy support in the promotion process is obviously insufficient, and copper wire is prone to oxidation and vulcanization. For encapsulated silica gel similar to water absorbing and breathable sponge, these alternatives make the bonding wire more vulnerable to chemical corrosion, reduce the reliability of the light source, use a long time, and the LED bulb is more likely to break and die

in terms of the solar street lamp controller, if the controller has a fault, the phenomena of "the whole lamp goes out", "the switch lamp is not on time", "partial damage", "individual LED lamp beads die", "the whole lamp flashes falsely" will appear in the process of testing and inspection

investigate whether the equipment is operating normally; Launch the vacuum pump of the finalization table

buyers need to pay attention to the following issues in the procurement process:

when purchasing, the first is the light attenuation test report, which is a very important link. At the time of bidding, each company will provide the light attenuation test reports of different units, some of which provide their own company's self inspection, and some of which are tested by a third party. Although the test results are good, the actual light attenuation varies greatly. The reason is known to everyone. So how can we know the genuine products with insight

the inspection of microcomputer controlled models will dominate, and the test report is first of all the designated organization recognized by the semiconductor alliance. For example, Beijing electric light source quality supervision and inspection center, Shanghai electric light source quality supervision and inspection center, semiconductor No. 13 Institute, etc. the light attenuation of the test reports from these units is reliable. The street lamps used in road lighting have high power and generate large heat. The light attenuation test shows two problems: the light attenuation is qualified and the power supply is qualified. If a street lamp can't pass the test in the laboratory, can the quality be guaranteed on the road

street light structure

after passing the road light attenuation test, the structure is a big problem. This problem is rarely concerned in the industry, which is also one of the main reasons for the large light attenuation of street lamps when they are actually used

as we all know, the haze area across the country is so large that it not only causes physical harm to people, but also causes the deterioration of the road lighting. Especially in the northern region, there is much dust and haze. After being used outdoors for a short period of time, the whole surface of the street lighting is covered with dust, and its heat dissipation effect is greatly reduced. This is also one of the main culprits that led street lamps are not known by everyone

according to this situation, the lamp design must be transparent from top to bottom. Double the heat dissipation area, because no street lamp management department will clean the radiator on time. In the long-term use, it can only be washed by rain. After the area is increased, there will be enough to reduce the effective heat dissipation area due to pollution

the light failure of street lamps has a barrel effect, and a short board is not good. Light failure has plagued everyone for so many years. The problem here is that you can solve the light failure by making a good lamp radiator. No, in the past, people began to discuss the use of low-power chip shell packaging, but the high-power chip is not good. It is said that the chip power is large and the heat cannot be dissipated. That's not the case. The heat of cob packaging is more concentrated, The problem of heat conduction can be completely solved through aluminum or copper supports

but the light attenuation is more difficult to control, because the radiator can not solve the light attenuation problem of the light source. There is a big misunderstanding in the light source packaging. The silica gel of the cob light source is too thick, and the thinner the silica gel should be packaged, the better, so as to facilitate the heat dissipation of the chip's luminous surface. This is the reason why the light attenuation of the cob light source is not easy to control

Copyright © 2011 JIN SHI