1. The drive is damaged
< br >
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\".
< br >
Theoretically speaking, as long as the parameters of the driver match the lamp bead board, it can be continuously powered and normally used. The interior of the driver is more complex, and the failure of any device (such as capacitors, rectifiers, etc.) may cause the output voltage to change, and then cause the lamp to darken.
< br >
Driver damage is one of the most common failures in LED lamps, which can usually be solved after replacing the driver.
< br >
< br >
2, LED burned
< br >
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.
< br >
There are obvious black spots on the surface of the burnt lamp bead, find it, use a wire to connect to its back, and short-circuit it; Or replace a new lamp bead, can solve the problem.
< br >
LED occasionally burned one, may be a coincidence. If you burn frequently, you must consider the drive problem - another manifestation of the drive failure is to burn the lamp bead.
< br >
< br >
3, LED light failure
< br >
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.
< br >
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.
Possible reasons are as follows:
The led light circuit is damaged
Check whether the line of the led light is damaged, if it is found damaged, it is necessary to immediately power off and then replace the line in time to avoid the occurrence of leakage caused by fire. led light damaged
Check whether the led light is damaged, use a good led light to replace, check whether it is normal, if the replacement is still only weak light, you need to re-check the cause.
There are two possibilities for LED lights to become weak,
First, the lamp bead aging, the luminous efficiency becomes low, the lamp bead unions heat aging for a long time, and the brightness gradually decreases.
Second, the power supply voltage is reduced, the lamp bead power supply voltage is powered by the switching power supply, the output voltage of the power supply is reduced, the brightness of the lamp bead will also be reduced.
1, first of all, you have to confirm that the circuit voltage is normal, eliminate the non-fault dimming caused by low voltage.
2, secondly, you have to check whether the built-in drive of the LED bulb is damaged or matched, if it has been damaged or does not match, it is necessary to replace, but the replacement of this generally requires some knowledge of LED circuits.
3, finally, it may be the chip problem, the specific reason is the light failure caused by the chip is not qualified, or the chip is burned by high temperature caused by the unreasonable heat dissipation structure.
It may be caused by the failure of the driving power supply of the led lamp. It is recommended to replace the led luminaire or replace the led driver power of the same specification.
Most likely, there's a slight change in the voltage in the loop