As the manufacturing technology of outdoor LED wall washer products gradually matures, the cost is getting lower and lower, and the cost performance is getting higher and higher. At present, low-power LED wall washer products have a wide range of applications in commercial areas such as large-screen outdoor displays. How to increase service life and reduce maintenance costs is also the focus of the industry. The positive attitude to solve the high cost problem is to analyze its failure mechanism, make up for technical defects, improve the reliability of outdoor LED wall washer products, and improve the price-performance ratio of wall washer. Theoretically, when the light output is attenuated to 50%, the wall washer product is considered ineffective. The faults discussed in this article are not only related to the LED's median lifetime failure due to reduced luminous flux, but also to circuit failures caused by other reasons, that is, various factors that lead to the performance of outdoor LED wall washer lights. Degraded device.

The failure mode of LED wall washer products has the following aspects in current observation: open circuit failure, light loss and degradation failure. The former is a complete failure of LED wall washer products due to a break in a certain point in the circuit, and the latter is caused by the passive recombination of wall washer products, resulting in a reduction in light conversion efficiency and a reduction in luminous flux. As for the failure of deterioration, it is due to the aging of the product during long-term use, which causes the product to fail.

LED failure analysis is the process of analyzing failed LEDs. In order to understand the cause of the equipment failure, it is necessary to conduct a comprehensive study of each component of the LED outdoor wall washer. First, the failure time of the LED wall washer should be analyzed. For components approaching design life, no analysis of decommissioning is performed. Other components will consider whether to perform a photoelectric parameter test and then perform an appearance test in the event of an open circuit failure. If the open circuit fails, a visual inspection using an optical microscope, metallographic microscope, etc. will be performed to analyze possible defects. If pins and bonds fail, an electron probe microscope will be used to analyze the cause of the pin failure. Infrared test the component to find internal defects. Finally, a fixed-point analysis test is performed on the defective part to determine the cause of the failure.

In the fault analysis process of LED wall washer, it is necessary to pay attention to the interconnection between various fault modes. In the analysis process, it is necessary to identify, combine the fault time, the application environment, and find an appropriate distinguishing method. While it is important to improve detection conditions and methods to find the cause of failure in the research process, it is more important to realize the importance of preventing failures. Therefore, after using the fault analysis to determine the cause of the wall washer failure, find out to avoid recurrence. The same type of failure mode approach is the purpose of failure analysis.

Better LED Limited is an independent and independent high-tech enterprise engaged in the design, development and production of LED products. Its products are mainly used in municipal construction, bridges, airports, hotels, shopping malls, garden greening, environmental transformation, energy saving projects and other fields. Baite Lighting has created many classic lighting engineering cases. We will, as always, adhere to the professional and dedicated corporate spirit, provide people with a high-quality light environment, and build a beautiful night.