Most designers think the quality of all LED products are the same . However , LED manufacturers and suppliers of many Asian manufacturers to the global supply of low-cost LED. Surprisingly , in these manufacturers can produce only a small portion of high-quality LED. For just as a simple indication to the application of LED commercial lighting wholesale is enough to meet the requirements . However, in many of the requirements consistency, reliability , solid state lighting and other fields instructions or need high -quality LED, especially in harsh environments , such as highways , military / aerospace , and industrial applications.
Fundamental factors
Distinguish between high and low quality factor is what LED ? How to tell the difference between the two LED 's ? In fact, the selection of high quality LED chip can start until the assembly is complete , during which there are many factors to consider. Tier-ONeLED manufacturing company to produce excellent and consistent indicators wafers are manufactured from high -quality LED material to start , and then you can create a good chip. LED indicators in determining the performance of all the conditions , the chemical materials used in the wafer production process is a very important factor. A 2 in. wafer can cut a plurality of 6000 LED chip, which is just inside the chip 's performance and overall individual is different. And an excellent chip maker manufacture chips in color, brightness, and other aspects of the voltage drop difference is very small. When the LED chip package is completed, many of their performance is likely there is a big difference, such as perspective. Furthermore, the effect of packaging materials is quite large , e.g. , silicone better than the performance of the epoxy resin.
Classification capability
LED manufacturers are not only excellent quality of the chips can be manufactured , but also have the ability under different LED colors , brightness, and viewing angle, and the voltage drop classify the package. High quality LED vendors to provide customers with a consistent operating characteristics of the product , while lower -quality LED suppliers can only offer similar to the " mix " of the LED. For the strict quality requirements of high-end applications , such as runway edge lights must meet FAA specifications color and brightness level , in order to ensure performance and safety , LED packaging consistency and it was strictly limited . Packing LED is used in less demanding applications will lead to failure and a series of non- conformance issues premature likely lead to a major accident. To avoid equipment downtime and ensure that the design specified in the LED with a reliable operating characteristics , and to avoid the strict quality requirements of high-end applications using the " mixed " product is very important.
For the strict quality requirements of high-end applications , such as runway edge lights must meet FAA specifications color and brightness level , in order to ensure performance and safety , LED packaging consistency and it was strictly limited . Packing LED is used in less demanding applications will lead to failure and a series of non- conformance issues premature likely lead to a major accident. To avoid equipment downtime and ensure that the design specified in the LED with a reliable operating characteristics , and to avoid the strict quality requirements of high-end applications using the " mixed " product is very important.
Product support capabilities
In addition to discrete LED, LED assembly and power supply for its performance , brightness and color and other indicators have a very significant impact. As the ambient temperature , current, circuit structure, so voltage spikes and environmental factors can affect the performance of LED indicators , proper circuit design and assembly is critical to protect and guarantee the performance of the LED . LED manufacturers also use a variety of different materials and techniques to design and assemble the circuit structure in most cases , the difference between the level of experience of the LED assembly by the same application will result in differences in the overall LED performance and reliability .
With the rapid growth of LED demand , global services market, manufacturers and assembly plants also increased rapidly. But regrettably, the surge in support for the manufacturers not only uses a lot of low quality LED, LED packaging and their experience of design engineers is also relatively low. Therefore , in addition to the existing experience and accurate screening through outside LED suppliers , OEM manufacturers must also examine their circuit design and assembly techniques are designed to ensure that it meets specifications and is designed to provide sufficient cooling capacity as lead LED failure and performance the main factor is inconsistent overheating.
To ensure that the design meets the requirements , OEM assembly must be detected and the LED circuit structure
Third-party testing
In order to eliminate the injustices that exist in the test , and many companies have commissioned a third party to assemble and test the circuit structure of the LED. An LED device may be tested or used for several weeks in harsh environments. During the test , the same pressure , temperature cycling, fixed / change in voltage , current, fixed / change test, test other harsh environmental conditions to determine whether the LED to meet the application requirements. Number of parameters to be changed before and after the test are recorded simultaneously measured to monitor the LED brightness , color changes and the voltage drop .
Accelerated life cycle testing is to avoid failure within specific application areas is a key test . Testing helps ensure that you can filter out those who expect at least 100,000 hours of work , but the work is only 1000 hours of LED failure occurred in advance. This situation is likely to arise because of the low quality of the LED ( it may be designed to be assembled unreasonably high quality LED) in brightness after 1000 hours will be reduced . In fact , if a low -quality LED driving current higher in the early work will be brighter than the high quality LED , however, the LED current will heat too high too quickly, the final result is less bright or burned.
In addition, the assembly technology in some way affect the performance of the LED chip itself is larger than are some examples . Design engineers should ask LED to LED supplier reliability specifications , and LED assembly should also be tested to ensure high brightness is indeed better . Some excellent LED suppliers can guarantee the reliability of their LED commercial lighting wholesale assembly technology can be sustained for three years or longer , and may further contain high -quality LED and appropriate design for specific applications , including the conduct of the final LED products.
The importance of testing
Two applications in the field of transport helps to explain adequately how to prevent the LED test failure in providing high visibility applications. In the early 1990s , LED brake lights for cars and trucks. Some LED design will soon appear on the inconsistency of performance indicators , and quickly burned down , the reason is probably due to the LED 's quality problems, perhaps the product itself is completely design problems . Until recently, in terms of traffic lights , when the LED light source to become more appropriate , this phenomenon was only seriously. Design covered with a diameter of 8 inches or LED 12-inch printed circuit board companies must choose LED and improve the design and other aspects of environmental and application needs.
Any of the above, if the stress tests or accelerated life cycle tests have been done, it can be considered to be of high quality LED or LED assembly is qualified, it can be applied to require a longer service life and higher reliability occasions it.
Rational use
Not every application requires a high quality LED assembly technology . If the LED assembly does not meet the stringent environmental requirements , the application will not necessarily be greater security risk , or if the maintenance cost of the final product is not very high , the use of some poor assembly techniques may be more appropriate .
The most fundamental point is the LED must be able to afford . Thus , within the limits of the cost required , it must be considered , such as product packaging supplier level , assembly and testing of the design experience factor .
Meet the needs of the application and market design is the most effective means to serve the end user . If the application requires high-end solution, then the chip vendor selection , design experience, and the factors that should be considered are tested . If the sales price is not considered high-end products , you should carefully consider other relevant factors, the difference between good and bad of the LED. Have the ability to classify the packaging level LED suppliers , and the ability to carry out reliability, accelerated life cycle testing vendors can be long-term cooperation , which helps manufacturers to develop a more reliable LED high-end products .
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