Most lighting designers think that all LED products are of the same quality. However, many manufacturers and suppliers of LED, Asian manufacturers to the global supply of low-cost LED. Surprisingly, only a small number of these manufacturers can produce high-quality LED. For applications that use only a simple indication, a low quality LED is sufficient to meet the requirements. But in many requirements of consistency, reliability, etc. in the field of solid state instructions or lighting must be made of high-quality LED, especially in harsh environments, such as highways, military / aerospace, and industrial applications.
What are the factors that distinguish the quality of LED? How to tell the difference between the two LED? In fact, the choice of high quality LED can start from the chip, until the assembly is completed, during which there are many factors to consider. Tier-OnELED manufacturing company is able to produce excellent, consistent wafer from the high quality of LED manufacturing materials, and then can make a good chip. The chemical material used in the wafer fabrication process is an important factor in determining the conditions for all LED performance indicators.
Excellent LED manufacturers can not only manufacture high quality chips, but also have the ability to classify and package them according to the LED color, brightness, voltage drop and viewing angle. The supplier will provide high-quality LED products consistent performance to the customer, and lower quality LED suppliers can only provide similar to the "mixed" LED.
For high-end, quality demanding applications, in order to ensure the performance and safety, LED packaging consistency is strictly limited. The poor packaging level of LED is used in demanding applications will lead to premature failure and a series of non conformance problems, is likely to lead to major accidents. In order to avoid downtime and ensure the design specified in the LED has characteristics of reliable, in the high-end and strict quality requirements in the application to avoid the use of "mixed" products is very important.
Product supporting capacity
In addition to discrete LED, the assembly and power supply of LED has a significant impact on its performance, brightness and color. Due to the environmental temperature, working current, circuit structure, voltage spikes and environmental factors can affect the performance of LED, the appropriate circuit design and assembly is the key to protect the LED and ensure the performance. LED manufacturers also use a variety of techniques and different materials to design the circuit structure and assembly, in most cases, the LED assembly experience level difference can result in differences in the same application LED in the overall performance and reliability.
With the rapid growth of LED demand, manufacturers and assembly plants in the global market are increasing rapidly. Unfortunately, the surge of support manufacturers not only a large number of low quality LED, their packaging and LED design engineer experience is relatively insufficient. Therefore, in addition to accurate screening of LED suppliers through the existing experience, OEM manufacturers must examine circuit design and assembly technology to ensure that they meet the design specifications, and whether the design provides sufficient heat dissipation capability, the main factors that lead to LED failure and inconsistent performance is overheating.
In order to meet the design requirements, OEM must detect the assembly and circuit structure of LED.
Accelerated life cycle testing is a critical test for avoiding failures in specific applications. Testing helps ensure that those who expect to work at least 100000 hours, but only work for 1000 hours in advance of the failure of LED. This situation is likely to occur because of the low quality of LED (which may also be unreasonably high in assembly design) in LED 1000 hours after the work will be reduced. In fact, a low quality LED if there is a higher drive current, in the beginning of the work will be better than the high quality of LED, however, the high current will make the LED fever too fast, the final result is dimmed or burned.
In addition, the assembly technology to some extent, the impact on the performance of the LED than the chip itself is also an example of large. The design engineer should ask the LED supplier for the reliability specifications of LED, and the LED assembly test should be carried out to ensure that the brightness is higher. They can ensure the reliability of LED assembly technology can be sustained for three years or longer some excellent LED supplier, properly designed and can further provide including high-quality LED and for a special application of the final product, LED.
Not every application requires high quality LED assembly technology. If the LED assembly does not comply with the harsh environment requirements, the application will not necessarily appear security risks, larger or, if the maintenance cost of the final product is not very high, the assembly technology of some poor may be more appropriate.
Meet the needs of the application and market design is the most effective means of service to the end user. If the application requires a high-end solution, then the chip supplier selection, design experience, as well as testing should be considered. If you do not consider the sale price of high-end products, you should carefully consider the difference between good and bad LED other factors. Have the ability of classification of packaging grade LED supplier, and capable of reliability and accelerated life cycle testing manufacturers can make long-term cooperation, which helps manufacturers using LED to develop high-end products more reliable.