Why does the LED light become darker and darker when used? Why does the LED light flash? What is the reason for the flickering of led lights?

　　LED lights become darker as they are used because LED lights have light decay phenomenon.

　　The light decay of LED lamp products is the weakening of the light signal during transmission. At this stage, LED products made by major global LED manufacturers have different degrees of luminous decay. High-power LEDs also have luminous decay, which is directly related  temperature. It is determined by the chip, phosphor and packaging technology. At present, the light decay of white LEDs on the market is one of the most important issues in the march  civil lighting.

　　Light decay generally refers  its luminous flux. When the surface of the phosensitive drum is charged, as the charge accumulates on the surface of the phosensitive drum, the potential continues  rise, and finally reaches the "saturation" potential, which is the highest potential. The surface potential will decrease over time. Generally, the working potential is lower than this potential. This process of natural decrease in potential over time is called the "dark decay" process. When the phosensitive drum is scanned and exposed, the dark area (referring  the surface of the phoconducr not irradiated by light) is still in the dark decay process; the bright area (referring  the surface of the phoconducr under the light irradiation) rapidly increases in the carrier density. The conductivity rises rapidly, forming a phoconductive voltage, the charge quickly disappears, and the surface potential of the phoconducr also drops rapidly. Call it ""Light Decay"".

　　It is a very common phenomenon that LED lights become darker as they are used. In addition  light decay, sum up several other reasons that can make LED lights dim, nothing more than the following three points.

　　Drive is damaged

　　LED lamp beads require low DC voltage (below 20V), but our usual mains is AC high voltage (AC 220V).  turn the mains electricity in the electricity needed by the lamp beads, a device called "LED constant current drive power supply" is needed.

　　In theory, as long as the driver's parameters match the lamp bead board, it can be continuously powered and used normally. The internal part of the driver is more complicated, any device (such as capacir, rectifier, etc.) failure may cause the output voltage  change, and then cause the lamp  dim.

　　Driver damage is the most common type of failure in LED lamps, and usually can be resolved after replacing the driver.

　　LED burned out

　　The LED itself is a combination of lamp beads one by one, if one or part of them is not bright, it will inevitably make the whole lamp dim. Lamp beads are generally connected in series and then in parallel-so if one lamp bead burns out, a batch of lamp beads may not light up.

　　There are obvious black spots on the surface of the burnt lamp bead, find it, connect a wire  the back of it, and short-circuit it; or replace it with a new lamp bead, you can solve the problem.

　　The LED burns out occasionally, it may be a coincidence. If it burns frequently, the driver problem must be considered-another manifestation of driver failure is  burn the lamp beads.

　　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 lamps and fluorescent lamps.

　　LED lights can't avoid light decay, but its light decay speed is relatively slow, and it is generally difficult  see changes with the naked eye. However, it is not ruled out that poor-quality LEDs, poor-quality light bead plates, or objective facrs such as poor heat dissipation, resulting in faster LED light decay.

　　Why does the LED light flash? What is the reason for the flickering of the led light

　　There is a capacir in the LED lamp driver, which can be undersod as a small capacity rechargeable battery: when the current passes through the capacir, the capacir will continue  charge-after fully charged, the capacir will release all the sred electrical energy at one time .

　　The LED light flickers, which belongs  the latter case: the light is extinguished during the capacir charging process-because the internal current of the capacir is small, the charging speed is very slow, so you can see that the light is extinguished with the naked eye. When the capacir is fully charged, it releases electrical energy at one time and lights up the lamp. However, because of the small amount of sred electric energy, the light will quickly go out-repeatedly charging and discharging, and the naked eye can see the light flickering.

　　When the lamp is in normal use, no flicker can be seen, because the current through the capacir is large and the charging speed is extremely fast.

　　So, what will cause a small current  flow inside the capacir? The first is because the quality of the capacir is not good-a high-quality capacir has a lot of sred power, and the tiny current in the circuit is not enough  sre energy in the capacir. The average starter is only about 20 yuan, and the cost of high-quality capacirs is probably more than 20 yuan.

　　In addition, we can also start from the source of tiny currents.

　　Possibility 1. Switch  control the neutral line

　　The switch controls the neutral wire, which means that the live wire is directly connected  the light (capacir). The live wire has a high potential. If there is a low potential in the line at this time, a potential difference will be formed-another name for the potential difference, called voltage. It's just that the potential difference at this time is much smaller than that of 220V. When voltage is applied across the capacir, a weak current will be generated.

　　Therefore, the direct connection of the live wire  the electric light will inevitably cause the LED light  flicker. This is a construction problem, and there is no other way except  change the direction of the zero line of fire.

　　Possibility 2. Neutral line is live

　　If both ends of the lamp (capacir) are connected  the zero line of zero potential, will everything be fine? Not at all!

　　The neutral wire is easy  be charged-especially the neutral wire of an electric light. Mainly because the light switch is o unreliable.

　　The quality of the internal structure of the current light switch is very worrying. If the distance between the neutral wire terminal is o close, the insulation is not qualified, etc., it may cause the neutral wire of the electric lamp  be charged.

　　If you don’t believe me, you can open the switch that you have connected  your home and test it with an electric pen. In theory, when the switch is off, only the Firewire terminal can light up the electric pen. But in actual use, the terminal connected  the zero line (lamp line) can also light up the electric pen in all likelihood.

　　It's just that most switches, even if the neutral line is charged, have a relatively low voltage, which is not enough  generate current in the line. But if the insulation is a little bit worse, the current generated is slightly larger, and the capacir will be charged.

　　Another point: when the switch has an indicar light, the indicar light will light up when the light is turned off. At this time, a weak current needs  be generated-this part of the current will flow through the capacir and be sred by the capacir.

　　These situations can be solved by replacing a better quality switch without indicar light.

　　Possibility 3. Inductive electricity

　　If there are many wires around the capacir, when other wires are working, induction electricity will be generated near the capacir-one sentence explains the reason for the induction electricity: two conducrs are placed in parallel  form a new capacir.

　　Most people are at a loss when facing this situation. There are two solutions at this time:

　　1. Replace the electric lamp with a fluorescent lamp or an incandescent lamp.

　　2. Connect a 220V relay coil in series with the starter of the LED light. Use the coil  consume the induced electricity generated by the circuit.