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Why Do LED Light Flicker?-Let’s Solve It!

LED lights are widely used in homes and commercial places, they are energy efficient, environmentally friendly, long life, and no too much heat.

However, in actual use, sometimes LED light flashing failure occurs: flicker, which not only affects the service life of the lamp, but also affects the user’s visual experience.

This article will introduce the causes and solutions of LED lighting flicker, help you quickly troubleshoot it.

led light flicker-beon

1, What is Flicker in LED Lights?

LED light flashing/flicker is a common fault situation, after the LED light is powered on, the light source changes rapidly and switches between light and dark over times.

Many users will encounter this situation when using LED lights. LED light flashing/flicker is generally divided into two situations, one is periodic flashing, the other is irregular flashing.


2, Why do my led light flicker?

  • Periodic flashing

    Periodic flashing means that the LED light flashes once every certain time, and the flashing time and frequency are relatively fixed. This fault condition may be caused by:

a. Led driver fluctuation: If the led driver of the LED light fluctuates too much, it will easily cause the LED light to flicker. In this case, we need to check whether the led driver of the LED light is stable. We can use a voltmeter to test it.

b. Poor heat dissipation: If the LED light works for a long time and the temperature is too high, it will cause poor heat dissipation, leading to flickering. In this case, we need to check whether the heat sink of the LED light is functioning properly.

c. Lamp aging: LED lights also have a service life. If used for too long, the lamp will age, which may also cause the LED light to flicker. In this case, we need to replace the LED lamp tube.

  • Irregular flashing

    Irregular flashing means that the flashing frequency and time of the LED light are not fixed. The flashing interval may be very short or the flashing time may be very long. This fault condition may be caused by:

a. Voltage instability: If the voltage of the LED light is unstable, it will easily cause the LED light to flicker irregularly. In this case, we need to check whether the power supply of the LED light is normal.

b. Circuit failure: If there is a circuit failure in the LED light, such as a damaged capacitor or transformer, it will cause the LED light to flash irregularly. In this case, we need to check whether the circuit of the LED light is normal.

c. Environmental interference: If there is a strong magnetic field or high-frequency electromagnetic wave interference near the LED light, it may also cause the LED light to flicker irregularly. In this case, we need to improve the working environment of LED lights.


3, What are the health effects by LED light flicker?

The light flicker has a stimulating effect on the human visual system, which will produce an uncomfortable feeling, and usually flashes are divided into visible flashes and invisible flashes according to people’s feelings. When the frequency is greater than 100Hz, the human eye can not feel the flicker phenomenon, but it will still cause eye fatigue, headache, etc., which is the result of stroboscope, and it is generally believed that the effect exists within 500Hz.

So, what harm will be brought to people by working or living in a flashing light environment for a long time?

The main hazards are embodied in two aspects: human health hazards and safety health hazards.

01 Human hazards  include possible headaches, migraines, fatigue; Increased eye pressure, reduced visual efficiency, blurred vision, decreased attention; Neurological problems, such as photosensitive epilepsy.

02 Safety health hazards   Such as optical illusions, including rotating machines, road lighting and car lights. Studies have shown that varying degrees of stroboscopic effects on people’s physiology and psychology, of course, are mostly negative, such as damaging vision, irritability, and inducing epilepsy.


bad case for flicker on led light


4, Do all lights flicker?

Led Lights flicking is because of the electricity we use is alternating current.

For example, in China, the power supply frequency of the alternating current is 50Hz. The supply voltage of the lamp fluctuates back and forth between the peak and the trough in the form of sine wave during the switching cycle. As a result, it is possible to generate stroboscope at Twice supply frequency, That is 100Hz.

In other words, there must be flicker, which is an objective physical factor. 

Generally, the frequency of visible flicker to the naked eye is lower than 60Hz. The higher frequency, will be lower flicker, and lower impact on people.  

flickr frequency

The frequency more 80Hz (80Hz-2000Hz), our eye is not easy to detect, but it has a greater impact on the spatial perception of our eye.

For example, seeing a moving object as a series of still images is known as the stroboscopic effect. Because of the stroboscopic effect, people can create the illusion that some fast-moving devices are running slowly or even stationary.

stroboscopic effect

The frequency more than 3120Hz can be considered completely harmless.


5, How to Stop Your LED Lights from Flickering ?


Flicker on LED lighting may be caused by unstable voltage, led driver failure, aging of the lamp chips, and overload of the led driver. Different reasons have different solutions. Let’s introduce flicker-free on led light with below causes and solutions.

  •  Voltage is unstable

A common cause of LED lights flickering is voltage instability. Voltage fluctuations may come from the power system, including power supply lines or AC power transformers. When the voltage fluctuates violently, the current of the LED light will also be affected, causing the light to flicker.

Solution: Stable voltage supply

To solve the problem of unstable voltage, consider installing a voltage regulator or voltage stabilizer. A voltage regulator stabilizes the power supply by controlling the fluctuation range of the output voltage. A voltage stabilizer can compensate for changes in the power supply and maintain a stable output voltage. These devices can help prevent the impact of voltage fluctuations on LED lights and reduce the probability of light flickering.

  • LED Drive failure

The LED driver is an electronic device that controls the LED light. It is responsible for converting electrical energy into the current and voltage required by the LED light. If the driver fails, it will cause unstable current output, causing the LED light to flicker. This can be caused by reasons such as overloading, overheating, or aging of the drive.

Solution: Replace the led driver

If the led driver fails, consider replacing the driver. Look for a high-quality led driver that is compatible with LED lights and make sure it has a power rating that meets the needs of the LED lights. Additionally, check and maintain your led driver regularly to ensure it is working properly and to prevent problems such as overloading and overheating.

Beon’s 509N7 series LED driver is very good at achieving bipolar flicker-free.

It is mass-produced and delivered every month. The price is affordable and the product quality is stable, providing our customers with higher-quality and excellent LED power supplies.

  • Led chips aging

The brightness and stability of LED lights are closely related to the quality and life of its led chips. If the LED chips age, their brightness will decrease, causing the light to flicker. This may be caused by poor quality of the led chips, prolonged use or harsh working environment.

Solution: Replace the lamp beads

When you find out the led chips of the light are aging, the led chips need to be replaced in time. Choose led chips with high brightness, stability and long life to ensure the stability and life of the light. In addition, provide appropriate heat dissipation conditions to extend the life of the led chips.

  • The power supply load is too heavy

If a power supply supplies multiple LED lights or other electrical devices, and the total power of these devices exceeds the rated load of the power supply, it will cause the power supply to be unstable, causing the LED lights to flicker.

Solution: Balance the load

Ensuring that the power supply load does not exceed the rated power can help prevent LED lights from flickering. If the load is too heavy, you should consider increasing the power supply capacity or reducing the load. In addition, connecting devices of different powers to different power sources reduces the possibility of loads interfering with each other.



This is the introduction to the relevant knowledge about what causes LED lights to flash. For those who need to know more information, please continue to pay attention to BEON. We will have better and more exciting content for you in the future.


Contact the Professionals

If you have flickering light issues in your life, our team at BEON LED can provide the necessary suggestion . Our expert electrical services include everything from home electrical inspections to LED lighting upgrades. Welcome to contact us now! 



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