LED street lamp procurement common pitfalls and precautions

Due to the features of low power consumption, high luminous efficiency, long life, energy saving and environmental protection, LED street lamps have gradually eliminated the traditional street lamps and become the main force of road lighting. The street lamp has a long lighting time and is installed outdoors, causing sun and rain. Therefore, the quality requirements of the lamps must pass. Otherwise, damage to the lamps will pose a threat to road safety. Therefore, regardless of whether a company, an organization, or an engineering company purchases a street lamp, it is necessary to discriminate carefully and avoid falling into the procurement trap.

Street lamp procurement requires attention to the following pitfalls:

Trap a fake chip, low-end chip

The core of an LED lamp is the chip, which directly determines the performance of the lamp! However, some unscrupulous manufacturers use the customer's unprofessionalism to consider from the cost and use low-cost chips to enable customers to buy low-quality products at high prices and create a direct economy. Loss and serious quality problems with LED lamps.

Trap 2 configuration virtual label, exaggerated configuration parameters

The fiery heat of solar street lamps also accompanies the reduction of price profits. The fierce competition has also led many solar street lamp manufacturers to begin the situation of swindling and reducing the production of imaginary products. The wattage of light sources, the wattage of solar panels, the battery capacity, and even the use of solar street light poles The material is in question. Of course, this is also the customer's repeated price comparison, and the demand for low prices is also related to the practices of some manufacturers.

Trap three thermal design bad configuration is not reasonable

In terms of heat dissipation design, the lifetime of a semiconductor device will decrease in multiples every 10 degrees of the junction temperature of the PN junction of the LED chip. Due to the high brightness requirements of LED solar street lamps, the use environment is more demanding. If the heat dissipation solution is not good, LED aging will quickly result in reduced stability. In addition, unreasonable configuration often leads to the actual use situation not reaching the expected value.

Trap four copper wire posing as gold wire and controller problem

Many LED manufacturers have tried to develop copper alloys, gold-clad silver alloy wires, and silver alloy wires instead of expensive gold wires. Although these alternatives are superior to gold wires in certain characteristics, they are far less stable in terms of chemical stability. For example, silver and gold-clad silver alloy wires are susceptible to sulfur/chlorine/brominated corrosion, and copper wires are susceptible to oxidation and sulfuration. For packaged silica gel similar to absorbent breathable sponges, these alternatives make the bond wire more susceptible to chemical attack, lower reliability of the light source, and longer use times, and the LED lamp beads are more likely to break and die.

In the solar street light controller, if there is a fault in the controller, during the testing and inspection process, "the whole lamp goes out", "the switch light is not on time", "partially damaged", "individual LED lamp bead dead lights", " The whole light flashes brightly.

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

Testing

The first is the light decay test report when purchasing, which is a very important link. When bidding, each company will provide light decay test report for different units, some provide their own company self-inspection, and some third-party testing. Although the test results in this test are good, the actual real light decline is very different. Everyone knows, so how can we get a true eye?

The test report is first designated by the Semiconductor Alliance. Such as Beijing Electric Light Source Quality Supervision and Inspection Center, Shanghai Electric Light Source Quality Supervision and Inspection Center, Semiconductor 13 and so on, the test reports from these units have a certain degree of credibility, the road lighting used by the street lamp power is high, resulting in heat, Two problems are explained by light decay detection: Passage of light failure and power supply pass. If a street lamp can't get through the lab, can it still ensure quality?

Street light structure

After passing the road light decay test, the structure is a big problem. This problem is seldom noticed in the industry. This is also one of the main reasons why the street light causes a large drop in light.

Everyone knows that the country's smog area is so large that it not only causes bodily harm to humans, but also causes the lighting of the roads to deteriorate. Especially in the northern regions, there is much dust and fog, and after a short period of outdoor use, the entire street lamp surface It is covered with dust and its cooling effect is greatly reduced. This is also one of the major culprits in LED streetlights.

According to this situation, the lighting design must be transparent. Double the heat dissipation area, because there is no street lamp management department will clean up the radiator on time. In the long-term use, it can only rely on rain rinse. After the area is increased, it also leaves enough space to reduce the effective heat dissipation area due to pollution.

Cooling

There is a barrel effect in the road light failure, and there is a short board. The light failure has been plaguing people for so many years. The problem with this is that if you do a good job with a lamp radiator, you will be able to solve the light failure. No, everyone started talking about it. The use of low-power chip cannonball-type packages can not be used for high-power chips. It is said that the chip's power is too large to dissipate heat. This is not the case. The COB package heat is more concentrated and the aluminum bracket or copper bracket can completely solve the problem of heat conduction.

However, light failure is more difficult to control. The reason is that good heatsink solution does not necessarily solve the problem of light source light failure. There is a big misunderstanding in light source packaging. COB light source is too thick and silica gel should be packaged as thin as possible to facilitate the chip. The heat emission of the light emitting surface is the reason why the light attenuation of the COB light source is not well controlled.