LED line lights have been used for too long, and their brightness has decreased compared with the past. This situation is called "light decay" in the industry. The physical phenomenon of light decay is unavoidable for lamps.

When LED line lights are used for outdoor lighting, long-term heat and rain will cause their brightness to decrease, plus human factors. Generally speaking, the service life of LED lights is about 50,000 hours. That is to say, if the light is turned on from 6 pm to 12 am every day, 6 hours a day, 365 days a year, then the lamp can be used for 2190 hours a year, so it can be used for 23 years.

But this is only theoretical data from the laboratory. In actual use, the service life of LED line lights cannot be simply calculated by mathematical multiplication and division, because there are other factors, such as improper use, which will accelerate the speed of light decay. In addition, during the installation process, in order to save time and facilitate the installation, the staff will ignore the number of LED line lights specified by the manufacturer for installation, which will overload the number of lamps connected in series, resulting in unstable voltage and current of the lamps, and seriously damage the service life of the lamps. According to market feedback information, the service life of outdoor LED line lights is mostly 2-3 years, and some can reach five or six years, but the longer the time, the lower the brightness of LED line lights.