The light decay of LED lamp products is the weakening of the signal of light in transmission. At this stage, LED products made by major LED manufacturers around the world have different degrees of light decay. High-power LEDs also have light decay, which is directly related to temperature. It is determined by the chip, phosphor and packaging technology. And the reason for the darkening will undoubtedly involve both.
LED lamp beads are required to work at low DC voltage (below 20V), but our usual mains is AC high voltage (AC 220V). To turn the mains into the electricity needed by the lamp beads, a device is needed, called "LED constant current drive power supply".
Theoretically speaking, as long as the parameters of the driver match the lamp bead board, the power supply can be continuously supplied and used normally. The inside of the driver is more complicated. The failure of any device (such as capacitor, rectifier, etc.) may cause the output voltage to change, which in turn causes the lamp to dim.
Driver damage is one of the most common faults in LED luminaires, which can usually be resolved after replacing the driver.
LED Burns Out
The LED itself is composed of lamp beads one by one. If one or part of them does not light up, it will inevitably make the whole lamp dim. The lamp beads are generally connected in series and then in parallel - so if a certain lamp bead is burned, it may cause a batch of lamp beads not to light up.
There are obvious black spots on the surface of the burned lamp bead, find it, connect a wire to its back, and short-circuit it; or replace it with a new lamp bead, all can solve the problem. The more you use the LED light, the darker it is because the LED light will have the phenomenon of light decay.