Most designers think all LED lighting product quality is the same. However, LED manufacturers and suppliers many Asian manufacturers to global supply cost of the LED. Surprisingly, in these manufacturers, only a few can produce high-quality LED. For indicative only as a simple application, low-quality LED is sufficient to meet the requirements. However, in many of the requirements consistency, reliability, solid-state lighting and other areas of instruction or must use high-quality LED, especially in harsh environments, such as highways, military / aerospace, and industrial applications.
In the New York subway station environment, security requirements are very demanding, LED must meet the quality requirements of fundamental factors.
Distinguish between high and low quality LED factor is what? How to tell the difference between two kinds of LED? In fact, the selection of high quality LED chip can begin until assembly is complete, during which there are many factors to consider. Tier-One LED manufacturing company to produce good, consistent indicators wafer is manufactured from high-quality LED material humble beginnings, in turn, can produce excellent chip. LED performance in determining the conditions of all, the wafer used in the production process is a very important chemical material factor.
A 2 in. wafers can be cut out of more than 6000 LED chips, there is only the individual and the overall chip performance indicators are different. And an excellent chip makers manufacture chips in color, brightness, and other aspects of the voltage drop difference is very small. When the LED chip package is complete, the performance of many of their great differences may exist, such as the viewing angle. In addition, the impact of packaging materials is quite large, for example, than the epoxy silicone performance.
Classification ability
LED manufacturers excellent quality can be manufactured not only of the chip, and also has a color based on the LED luminance, voltage drop and angle to classify the different packaging capabilities. High quality LED vendors to provide customers with consistent product performance characteristics, while lower-quality LED suppliers can only offer similar to the “mixed” of the LED.
For the high-end, quality demanding applications, such as runway edge lights, must meet FAA specifications color and brightness level, to ensure performance and safety, LED packaging consistency and it was strictly limited. Packing LED is used in less demanding applications will lead to premature failure of a series of non-conformance issues, is likely to lead to a major accident. To avoid equipment downtime and ensure that the design requirements of the LED with a reliable operating characteristics, and the strict quality requirements of high-end applications avoid the use of “mixed” product is very important.
Products supporting capacity
In addition to discrete LED, LED assembly and power supply for its performance, brightness and color indicators have a very significant impact. The ambient temperature, the operating current, the circuit structure, so the voltage spikes and environmental factors can influence the performance of LED, proper circuit design and assembly is to protect the LED and ensure the performance of the key. LED manufacturers can use a variety of techniques and different materials to design the circuit structure and assembly, in most cases, LED assembly difference in the experience of the level of the same application will cause the LED in the overall performance and reliability differences.
With the rapid growth in demand for LED, serve the global market manufacturers and assembly plants also increased rapidly. Unfortunately, the surge in support for manufacturers not only a large number of low-quality LED, their packaging and LED design engineers relative lack of experience. Therefore, in addition to the existing experience and accurate screening through LED suppliers outside, OEM manufacturers must also examine their circuit design and assembly techniques to ensure that it meets design specifications, and design provides adequate cooling capacity, because causes the LED failure and performance The main factor is inconsistent overheating.
To ensure that it meets the design requirements, OEM must detect the LED assembly and circuit structure.