Notes For Purchase Of LED Streetlights

As an important lighting facility for urban development, the quality of LED streetlights is the top priority of all major projects.However, now the market price of LED street lamp is multifarious and the quality is uneven.Many reasons are that in the Chinese market, manufacturers do not have strong patent awareness and lack of innovation. As a result of the industry price war, manufacturers continue to reduce costs in materials and processes, which has a significant impact on the quality of LED streetlights.It is common to see street lamps dim after a period of use.Therefore, no matter enterprises, institutions or engineering companies need to be careful when purchasing street lights to avoid falling into the procurement trap.

There are 8 notes for purchase of LED streetlights, which is also known as the procurement erroneous zone or trap:

1. Falsely mark product parameter

The popularity of LED street lamps is accompanied by the reduction of price and profit.The fierce competition also leads to the situation that many businesses begin to jerry-build and falsely mark product parameters.This is also caused by customers' repeated price comparison and low price requirements, and is also related to the practices of some manufacturers.

2. Counterfeit chips

The core of LED lighting fixtures is the chip, which directly determines the performance of LED lamps.However, some bad merchants make use of customers' unprofessional, considering from the cost, using low-price chips, so that customers buy low-quality products with high unit price, causing direct economic losses of buyers, and causing serious quality hidden trouble for LED lamps.

3. The copper wire was passed off as gold

Many LED manufacturers are trying to develop copper alloy, gold-coated silver alloy wire, silver alloy wire to replace the expensive gold wire.Although these alternatives are superior to gold wire in some properties, they are much less chemically stable.For example, silver wire and gold-coated silver alloy wire are easily corroded by sulfur/chlorine/bromine, and copper wire is easily oxidized and vulcanized.For encapsulated silica gel, which is similar to a water-absorbing and breathable sponge, these alternatives make the bonding wires more vulnerable to chemical corrosion, the reliability of the light source is reduced, and the LED lamp bead is more likely to break and die over time.

4. Unreasonable design of light distribution system

In terms of optical design, if the light distribution system of street lamp is not designed reasonably, the lighting effect will not be ideal.In the test, there will be "zebra crossing", "uneven illumination", "yellow circle" and other problems.

5. Poor heat dissipation design

In terms of heat dissipation design, the life of semiconductor devices will decrease by multiple if the PN junction temperature of LED chip increases by 10 degrees.Due to the high brightness requirements of LED streetlights and the harsh use environment, if the heat dissipation is not properly solved, it will rapidly lead to LED aging and reduced stability.

6. Power failure

In terms of drive power supply, if there is a failure of the power supply, in the process of testing and inspection, there will be "the whole light out", "partial damage", "individual LED light bead dead", "the whole light flicker virtual bright" phenomenon.

7. Safety failure

The security aspect also deserves careful attention.Power supply has no leakage protection; Ballast quality of street lamp is shoddy; The circuit breaker is not tested for sensitivity calibration and the rated trip current is too large. Using cable metal skin as PE main line,which is complicated and has low reliability. The IP waterproof and dustproof level is too low.

8. There are substances harmful to the light source in the lamp

LED light source blackening is a common problem encountered by major LED companies. Most materials in lamps need to be investigated for substances that affect the life of the light source.

The occurrence of the above problems will have a great impact on the performance of LED streetlights, and even cause the failure of LED street lamps in advance.So how to buy LED streetlights? What do buyers should do?

The practical skills about how to buy LED streetlights can be divided into three major parts: The purchase link to see the report;Street lamp structure is very important;Light source part can not be ignored.

1. Purchasing links

When purchasing, the first is the detection report of light decay,which is a very important link.When bidding, each company will provide a detection report about light decay, some provide their own company self-test, there are also some third party detection.Although the result of test report here is good, the gap of actual real light decay is large, the reason is known, so how to discern the real product?

The detection report is first accredited 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 institute.The detection reports from these units are reliable.Streetlights used for road lighting have high power and generate large heat. Two problems can be confirmed by light decay detection: light decay is qualified and power supply passes muster.If a street lamp can't reach a standard in the lab, can it still be of good quality?

2. Streetlight structure

After the light decay detection, the structure of LED streetlights is a big problem.This problem is rarely paid attention to in the lighting industry, which is also one of the main reasons for the large light decay in the actual use of street lamps.As we all know,LED streetlights work outdoors throughout the year, and after using for a period of time, the entire surface of the lamps will be covered with dust, so that the heat dissipation effect will be greatly reduced.According to this kind of circumstance, the structure design of LED street light is very important.

3. Light source part

The light decay problem of streetlights has"buckets effect", it is not ok even if there is a short slab.The light decay of LED lamps is a problem that has puzzled manufacturers for many years.Light decay can be solved by a good radiator?That's not true.There is a big mistake in the packaging of the light source. The silica gel of the COB light source is too thick, so the silica gel should be packaged as thin as possible to facilitate the heat dissipation of the chip luminous surface. This is the reason why the light decay of the COB light source is not well controlled.

Generally speaking, as outdoor equipment installed high above the ground,LED Streetlights are difficult to install and harder to maintain.For street lamp managers, the unstable quality of product drives up maintenance costs.Therefore, we must pay more attention to the purchase, to avoid the purchase of unqualified LED street lamps.