The phenomenon of LED light decay is an objective fact. It is meaningful to study the light attenuation law of LED. However, the materials and processes of LEDs do not mean that they have reached a very mature peak. The performance of LEDs is still improving. Therefore, products at different stages may have different light decay laws. Moreover, different power supply current methods will also lead to different light attenuation laws. For example, whether the current is a constant direct current, or a current with larger pulsation, a larger current, or a smaller current, whether it is continuous long-term work, or intermittent work. Understanding the law of light decay is helpful to the correct use of LEDs. As for saying: "The brightness is basically only about 80% of the initial aging at 20mA at room temperature for 1000 hours." This may have meaning for white and blue LEDs ten years ago. At that time, the lifespan of white and blue LEDs was really not good. The current LED, at a standard room temperature of 25°C, does not have at least 6000 hours of aging, and it is impossible to summarize the attenuation law. 6000 hours is just to calculate the initial value of the life to obtain the data. To calculate the life, it needs to continue for a longer time to obtain the subsequent data, and then calculate. Because there was no further research later, it is unclear whether the initial aging time of 6000 hours is sufficient. LM-21 also proposed that the initial aging time is 6000 hours, presumably they have also studied it. In addition, the aging of semiconductor devices is not necessarily damage. It depends on the aging time. The necessary time aging can bring out bad products on the one hand, and on the other hand it can have a proper quenching effect, so that the performance of the device can reach a stable stage. For example, some people may encounter that after some LEDs are used or aged for a period of time, the luminous flux will be higher than the initial stage, and the luminous flux will be stable. In the past, semiconductor diodes and triodes had to be aged for hundreds of hours before leaving the factory. www.szbjhkj.com The amount of LED may be too large, perhaps the cost factor, or the person who did LED packaging at the beginning is not a semiconductor professional and does not understand, so the aging treatment is not done before leaving the factory.