Due to the characteristics of low power consumption, high luminous efficiency, long life, energy saving and environmental protection, LED street lamps have gradually eliminated traditional street lamps and become the "main force" of road lighting. The lighting time of the street lamp is long, and it is installed outdoors, causing the sun and rain, so the quality requirements of the lamps must be passed. Otherwise, the damage to the lamps will pose a threat to road safety. Therefore, whether enterprises, institutions or engineering companies need to be cautious when purchasing street lamps, to avoid falling into the procurement trap.

Street lamp purchases need to pay attention to the following traps:

Trap 1 Counterfeit chips, low-end chips

The core of LED lamps is the chip, which directly determines the performance of the lamp! However, some unprofessional manufacturers take advantage of the unprofessionalism of customers, considering the cost, using low-cost chips, so that customers can buy low-quality products at high unit prices. Economic losses, and cause serious hidden dangers to the quality of LED lamps.

Trap 2 Configuring false labels and exaggerating configuration parameters

The popularity of solar street lights is also accompanied by a decrease in price profits. The fierce competition has also led to many solar street light manufacturers cutting corners and falsely standardizing product parameters, such as the wattage of light sources, the wattage of solar panels, battery capacity, and even solar street light poles. materials are in problem. Of course, this is also caused by customers' repeated price comparisons and requests for low prices, and it is also related to the practices of some manufacturers.

Trap 3 Poor heat dissipation design and unreasonable configuration

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

Trap 4 Copper wire pretending to be gold wire and controller problem

Many LED manufacturers try to develop such as copper alloy, gold clad silver alloy wire, silver alloy wire to replace the expensive gold wire. While these alternatives are superior to gold wire in some properties, they are much less chemically stable, such as silver wire and gold-clad silver alloy wire susceptible to sulfur/chlorine/bromide corrosion, and copper wire susceptible to oxidative sulfidation. For encapsulated silicones similar to water-absorbing and breathable sponges, these alternatives make the bonding wires more susceptible to chemical corrosion, the reliability of the light source is reduced, and the LED lamp beads are more likely to break and die after a long time of use.

In terms of solar street light controller, if the controller is faulty, in the process of testing and inspection, there will be "the whole light is off", "the switch light is not on time", "partial damage", "individual LED lamp bead dead light", " The whole light is flickering falsely" phenomenon.

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

detect

When purchasing, it is the light decay test report, which is a very important link. When bidding, each company will provide light attenuation test reports of different units. Some provide their own self-tests, and some third-party tests. Although the test reports here are good, the actual light attenuation is very different. The reason Everyone knows it, so how can we discern the real product with our eyes?

Test Report** is a designated body 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, and the Thirteenth Institute of Semiconductors, etc., the light decay of the test reports from these units is credible. The street lights used for road lighting have high power and generate large amounts of heat. The detection of light decay shows two problems: the light decay is qualified, and the power supply is passed. If a street light can't pass the test in the laboratory, can the quality be guaranteed on the road?

street light structure

After passing the pass of the street light attenuation test, the structure is a big problem. This problem has received little attention in the industry, and it is also one of the main reasons for the large light decay when street lamps are actually used.

As we all know, the area of ​​smog in the country is so large, it not only harms people's body, but also causes the degradation of street lights. Especially in the northern region, there is a lot of dust and haze. Covered with dust, its cooling effect is greatly reduced. This is also one of the main culprits that LED street lights are not known by everyone.

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

heat dissipation

There is a wooden barrel effect in the decline of street lights, and it is not enough to have a short board. The light decay has plagued everyone for so many years. The problem here is that you can solve the light decay by making the radiator of the lamp well. No, everyone started to discuss it in the past. Using a low-power chip shell-type package, but a high-power chip will not work. It is said that the heat cannot be dissipated due to the high power of the chip. This is not the case. The COB package has more concentrated heat, and the heat conduction problem can be completely solved by using an aluminum bracket or a copper bracket.

However, it is more difficult to control the light decay. The reason is that a good heat sink may not solve the problem of light decay 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. The light-emitting surface dissipates heat, which is why the light decay of the COB light source is not well controlled.