We all have such a life experience. The newly bought LED lights are always very bright, but after a period of time, many lights will become darker and darker. Why do LED lights have such a process?

Let’s take you to the bottom today! To understand why your home’s LED lights are getting dimmer, we need to understand a professional term – LED light decay.

The more LED lights are used, the darker they are because LED lights will have light decay.

The light attenuation of LED lamp products is the signal weakening of light in transmission. At present, the light attenuation degree of LED products made by major LED manufacturers in the world is different. High power led also has light attenuation, which is directly related to temperature, mainly determined by chip, phosphor and packaging technology. At present, the light decay of white LED in the market is one of the most important problems in the development of civil lighting.

Light decay generally refers to its luminous flux. When charging the surface of the photosensitive drum, with the accumulation of the charge on the surface of the photosensitive drum, the potential increases continuously, and finally reaches the “saturation” potential, which is the highest potential. The surface potential will decrease with the passage of time. Generally, the working potential is lower than this potential. The process that the potential naturally decreases with time is called “dark decay” process. When the photosensitive drum is scanned and exposed, the potential of the dark area (the surface of the photoconductor that is not illuminated by light) is still in the process of dark decay; In the bright region (the surface of the photoconductor irradiated by light), the carrier density in the photoconductive layer increases rapidly, the conductivity increases rapidly, and the photoconductive voltage is formed, the charge disappears rapidly, and the surface potential of the photoconductor also decreases rapidly. It’s called “light decay”.