The service life of the wall washer mainly includes factors such as the quality and reliability of the product, among which the reliability of the product is a key element that affects the service life of the product. Reliability refers to the ability of a product to complete a specified function under specified conditions and within a specified time. The main reasons for poor product quality and reliability include low design level, lack of hardware application experience, lack of electronic reliability system engineering methods and other factors. Practice has proved that the use of appropriate reliability engineering technology to test, evaluate and improve products can increase product reliability by more than 10 times, thereby prolonging the service life of the product.

    The measurement and evaluation of the life performance of traditional light sources have been standardized and interchangeable. Therefore, the life of traditional light sources can be met by replacing damaged light sources and lamp control devices designed with a 10-year lifespan, so it is generally not evaluated The life of traditional light source lamps. The life of the wall washer is related to many factors such as the life of the LED, the LED driver and the environment provided by the lamp to the LED. At present, there are many forms of wall washer. Except for the LED with a standard lamp holder, other LED lamps are not interchangeable. In this way, the service life of different wall washer lamps can only be determined through relevant service life evaluations. When evaluating the life of the wall washer, it is necessary to claim not only the maintenance life (LX) of the luminous flux, but also the failure rate (FX).

 In order to confirm whether the life of the wall washer reaches 35,000 hours, a long-term life test is required. The current practice basically forms the following consensus: Since the output light power of GaN-based LED devices is unstable, according to the regulations of the American ASSIST Alliance, electricity is required. After 1000 hours of aging, the measured optical power or luminous flux is the initial value. After adding the rated current for 3000 hours, the measured luminous flux attenuation should be less than 4%, and then adding the current for 3000 hours, the luminous flux attenuation should be less than 8%, and then energizing for 4000 hours, a total of 10,000 hours, the measured luminous flux attenuation should be less than 14%, that is, the luminous flux reached More than 86% of the initial value. Only then can it be proven to ensure that the LED life span reaches 35,000 hours.

    Unlike traditional lighting sources, which can be used for photometric test alone, relative method can be used for photometric measurement. The LED light source of the wall washer is extremely sensitive to temperature, and it is not suitable to separate the LED light source from the lamp for separate measurement. The absolute method should be used for photometric measurement. Perform a photometric test on the entire luminaire.