Let's talk about the light decay and led flickering
Light Decay
The more you use the LED light, the darker it is because the LED light will have the phenomenon of light decay.
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. At present, the light decay of white LEDs on the market is one of the primary problems when entering into civilian lighting.
Light decay generally refers to its luminous flux. When charging the surface of the photosensitive drum, as the charge accumulates on the surface of the photosensitive drum, the potential also continues to rise, and finally reaches the "saturation" potential, which is the highest potential. The surface potential will decrease over time. Generally, the potential during operation is lower than this potential. The process of this potential naturally decreasing with time is called the "dark decay" process. When the photosensitive drum is scanned and exposed, the potential of the dark area (referring to the surface of the photoconductor that is not irradiated by light) is still in the dark decay process; The conductivity rises rapidly, forming the photoconductive voltage, the charge disappears rapidly, and the surface potential of the photoconductor also drops rapidly. It's called "light decay".
It is a very common phenomenon that LED lights to become dimmer as they are used. In addition to light decay, the reasons for dimming LED lights are nothing more than the following two points.
Drive corruption
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 beadboard, 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 a 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 LED burns one out every now and then, probably by coincidence. If it burns frequently, you need to consider the driver problem - another manifestation of driver failure is to burn the lamp bead.
Why does the LED light flicker? What is the reason for the flashing LED lights. . .
There is a capacitor in the driver of the LED light, which can be understood as a rechargeable battery with a small capacity: when the current passes through the capacitor, the capacitor will continue to charge - after fully charged, the capacitor will release all the stored energy at one time .
The flashing LED light belongs to the latter case: during the charging process of the capacitor, the light is off-because the internal current of the capacitor is small, the charging speed is very slow, so the light can be seen to be off with the naked eye. When the capacitor is fully charged, it releases electricity at one time and lights up the lamp. But because there is less energy stored, the light will go out very quickly—recharging and discharging repeatedly, and the naked eye sees the light flickering.
The fact that the lamp does not flicker during normal use is because the current through the capacitor is large and the charging speed is extremely fast.
So, what would cause a small current to flow inside the capacitor? The first is that the quality of the capacitor is not good - high-quality capacitors store a lot of electricity, and the tiny current in the line is not enough to store energy in the capacitor.
In addition, we can also start with the source of the tiny current.
Possibility 1: The switch controls the neutral line
The switch controls the neutral wire, which means that the live wire is directly connected to the lamp (capacitor). 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 potential difference, called voltage. However, the potential difference at this time is much smaller than that of 220V. When a voltage is applied across the capacitor, a small current is generated.
Therefore, if the live wire is directly connected to the electric light, it will inevitably cause the LED light to flicker. This is a construction problem, and there is no other way than to change the direction of the zero line.
Possibility 2: The neutral line is live
Both ends of the lamp (capacitor) are connected to the zero line of zero potential. Is everything OK? Not at all! The neutral wire is easily charged - especially the neutral wire of a light bulb. Mainly because the light switch is so unreliable.
The quality of the internal structure of the current light switch is very worrying. The distance between the neutral and live wire terminals is too close, the insulation is not up to standard, etc., which may cause the neutral wire of the lamp to be charged. If you don't believe me, you can disassemble the switch that has been connected in your home and test it with an electric pen - in theory, when the switch is closed, only the live wire terminal can light the electric pen. However, in actual use, the binding post connected to the neutral wire (light wire) can also light up the electric pen in all likelihood.
It's just that most switches, even if the neutral line is energized, carry a relatively low voltage, which is not enough to generate current in the line. But if the insulation is a little worse, the current generated is slightly larger, which will charge the capacitor.
Another point: when there is an indicator light on the switch, the indicator light will be on when the light is turned off, and a weak current needs to be generated at this time - this part of the current will flow through the capacitor and be stored by the capacitor. These situations can be solved by replacing the switch with a better quality switch without an indicator light.
Possibility 3: Inductive Electricity
If there are many wires around the capacitor when other wires are working, induced electricity will be generated near the capacitor - one sentence explains the reason for the induced electricity: two conductors are placed in parallel to form a new capacitor.
Most people are helpless in the face of this situation, and there are two solutions at this time:
1) Replace the light bulb with a fluorescent or incandescent light.
2) On the starter of the LED light, connect a 220V relay coil in series. Use the coil to dissipate the induced electricity generated by the line.
WANT TO FIND NO LIGHT DECAY LED FIXTURE?
Post time: Feb-11-2022
