Why does the Led Tube Light get darker and flicker after use?

Before starting today's topic, we can't "do nothing", let's take a look at the production process of Led Tube Light:

At present, the production of Led Tube Light must first undergo rigorous computer programming, make the light board, and then enter the assembly line of the assembly workshop. We will not expand the details.

Everyone has such a life experience that the Led Tube Light just bought is always very bright, but after a period of time, many lights will become darker and darker. Why does the Led Tube Light have such a process? Today, Led Tube Light manufacturer Xinjielighting will take you to find out!

The reason why Led Tube Light is getting darker

To understand why your Led Tube Light is getting darker and darker, we must first understand a professional term

1) LED light decay phenomenon.

LED light decay refers to the fact that after a period of time when the LED is lit, its light intensity will be lower than the initial light intensity and cannot be recovered, that is, the reduced part is called the light decay of the LED. The more you use the Led Tube Light, the darker it is because the Led Tube Light will have light decay.

The light decay of Led Tube Light products is the weakening of the light signal during transmission. At this stage, the 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 mainly determined by Led Tube Light 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 increases continuously, 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's a very common phenomenon that Led Tube Light gets darker as you use it. In addition to light decay, the reasons that can make Led Tube Light dark are nothing more than the following two points.

2) Led Tube Light drive is damaged

Led Tube Light 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 Led Tube Light driver match the lamp bead board, it can continue to supply power and be used normally. The inside of the Led Tube Light driver is more complicated. The failure of any device (such as capacitors, rectifiers, etc.) may cause the output voltage to change, which in turn causes the Led Tube Light to dim.

Drive damage is one of the most common failures in Led Tube Light fixtures, which can usually be resolved after replacing the drive.

3) Led Tube Light with LED burnt

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. Led Tube Light 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 lamp bead after the Led Tube Light is burned. Find it, connect a wire to its back, and short-circuit it; or replace the lamp bead with a new one, all of which can solve the problem.

The LED burns one out every now and then, probably by coincidence. If it burns frequently, you should consider the problem of the Led Tube Light driver-another manifestation of driver failure is to burn the lamp beads.

Led Tube Light Flickering Reasons

Why does the Led Tube Light flicker?

1) Led Tube Light capacitor

There is a capacitor in the driver of Led Tube Light, which can be understood as a rechargeable battery with a small capacity: when a current passes through the Led Tube Light capacitor, the capacitor will continue to charge - after fully charged, the capacitor will store the battery at one time. All power is released.

The flashing of the Led Tube Light belongs to the latter case: during the charging process of the capacitor, the light is off-because the internal current of the Led Tube Light 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.

However, due to the less energy stored, the Led Tube Light will soon go out - charging and discharging repeatedly, and the naked eye can see the light flickering.

Led Tube Light does not see flickering during normal use, 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 Led Tube Light 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. The average starter is only about 20 yuan, and the cost of high-quality Led Tube Light capacitors is probably more than 20.

2) Led Tube Light tiny current source

In addition, we can also start from the source of the tiny current of the Led Tube Light.

Possibility 1: The switch controls the neutral line

The Led Tube Light switch controls the neutral wire, which means the live wire is directly connected to the lamp (capacitor). The Led Tube Light 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 Led Tube Light capacitor, a small current will be generated.

Therefore, if the live wire is directly connected to the electric light, it will inevitably cause the Led Tube 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 Led Tube Light neutral wire is easily charged - especially the neutral wire of an electric light. Mainly because the light switch is so unreliable.

The quality of the internal structure of the current Led Tube 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 Led Tube Light switch is turned off, 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 Led Tube Light switches, even if the neutral line is charged, carry a relatively low voltage, which is not enough to generate current in the line. But if the insulation is any worse, the generated current is slightly larger, which will charge the Led Tube Light 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 small 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 Led Tube Light capacitor, when other wires are working, induced electricity will be generated near the capacitor - a word to explain 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 Tube Light, connect a 220V relay coil in series. Use the coil to dissipate the induced electricity generated by the line.

The above is all the information about the darkening and flickering of Led Tube Light brought to you by Xinjielighting. I hope the above content can help you find the key to the problem that Led Tube Light is getting darker and darker. For more information about Led Tube Light, please visit Read below:

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