LED lamp beads are required to work at DC low voltage (below 20V), but our usual mains power is AC high voltage (AC 220V). To change the mains power into the electricity required by the lamp beads, a device is needed, called "LED constant current drive power".
Theoretically, as long as the parameters of the driver match the lamp bead board, the power can be continuously supplied and used normally. The inside of the driver is relatively complicated. Any failure of any device (such as capacitors, rectifiers, etc.) may cause the output voltage to change, which may cause the lamp to dim.
Driver damage is the most common type of failure in LED luminaires, which can usually be resolved after replacing the driver.
2.LED burned out
The LED itself is a combination of lamp beads one by one. If one or a part of them is not lit, the whole lamp will dim. Lamp beads are usually first connected in series and then in parallel-so if a certain lamp bead burns out, it may cause a batch of lamp beads to be off.
There are obvious black spots on the surface of the burned-out lamp bead. Find it, connect a wire to the back of it, and short it; or replace it with a new lamp bead to solve the problem.
One LED burns occasionally, it may happen by chance. If it is burned frequently, it is necessary to consider the drive problem-Another manifestation of a drive failure is to burn the lamp beads.
3.LED light decay
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 rate is relatively slow, it is difficult to see the change with the naked eye. However, inferior LEDs, inferior light bead boards, or objective factors such as poor heat dissipation do not rule out LED light decay speed.