1. The drive is damaged. LED lamp beads are required to work at DC low voltage (below 20V), but our usual mains power is AC high voltage (AC 220V). The electricity needed to turn the mains power into a lamp bead requires a device called \"LED constant current drive power supply\".
2, LED burned. LED itself is composed of a combination of light beads, if one or a part of it is not bright, it is bound to make the whole lamp dark. Lamp beads are generally connected in series and then in parallel - so a lamp bead burned, it may lead to a batch of lamp beads are not bright.
3, LED light failure. The so-called light decay is that the brightness of the luminous body is getting lower and lower - this situation is more obvious in incandescent and fluorescent lamps. LED lights can not avoid light decay, but its light decay speed is relatively slow, generally difficult to see the change with the naked eye. However, it does not exclude inferior LED, or inferior light bead board, or due to objective factors such as poor heat dissipation, resulting in faster LED light decay.
Long used LED lights will become less bright because LED lamps have a life and light decay phenomenon. 1. The life of the LED lamp refers to its effective working time, in the process of use, the LED chip and luminous materials will gradually age, the current transfer efficiency will be reduced, resulting in a decrease in brightness. 2. In addition, LED lights also exist light decay phenomenon, that is, after a period of use, the light decay is more obvious. This is because during the luminous process of LED lamps, the luminous materials inside them will gradually lose, resulting in reduced brightness. 3. In addition, LED lights are also susceptible to the influence of the external environment in use, such as dust accumulation, temperature changes, etc. These external factors will also cause the brightness of LED lights to weaken. In summary, LED lights will become less bright after a long time because of the life and light decay phenomenon.