Troubleshooting LED Strips: Resolving Buzzing and Humming Noises | Hitlights

In this article, we will talk about the common reasons behind buzzing or humming noises in LED strips and provide practical troubleshooting steps to address these issues effectively.

Table of Contents:

Understanding the Buzzing or Humming Phenomenon

1. Electric Current and LED Operation

LEDs operate by converting electrical energy into light, utilizing a process known as electroluminescence. When an electric current passes through the LED chips within the strip, they emit light. However, this current flow can sometimes interact with other electrical components or environmental factors, leading to vibrations or audible noise.

2. Causes of Buzzing and Humming Noises

Several factors can contribute to the buzzing or humming noises emitted by LED strips. Let's explore some of the most common causes:

  • Power Supply Issues

LED strips require a stable and properly regulated power supply to function properly. Inadequate power supply can result in voltage fluctuations or insufficient current, leading to buzzing or humming noises. Furthermore, the type of power supply used, such as magnetic transformers or electronic power supplies, can also influence noise levels.

  • Magnetic transformers tend to generate a certain level of audible noise.
  • Due to solid-state electronics, Electric Drivers tend to generate less audible noise.
  • Dimmer Compatibility 

If you have connected your LED strip to a dimmer switch, it's essential to ensure compatibility between the two components. Incompatible dimmers may not deliver a smooth and consistent current to the LED strip, causing buzzing or humming sounds. Be sure to check the compatibility of the dimmer switch with the dimmable driver.  There are also different types of dimming methods used for LED strip lights, and the compatible LED drivers may vary depending on the dimming method used.

  • Triac Dimming:  Triac dimming, also known as phase-cut dimming, is commonly used with AC-powered LED strip lights. It requires a compatible LED driver that supports triac dimming. These drivers are designed to work with leading-edge or trailing-edge dimmers, which control the power supplied to the LED strip lights by modifying the AC voltage waveform. Triac-compatible LED drivers are typically labeled or specified as such.
  • PWM Dimming: PWM (Pulse Width Modulation) dimming is a popular dimming method used with both AC-powered and DC-powered LED strip lights. It involves rapidly turning the LEDs on and off at varying intervals, controlling the brightness by adjusting the pulse width. PWM-compatible LED drivers are designed to work with PWM dimming signals. These drivers often accept a PWM input signal, typically with a specific voltage range or frequency, to regulate the LED strip light intensity.
  • 0-10V Dimming: 0-10V dimming is a commonly used analog dimming method for LED strip lights. It requires a compatible LED driver that accepts a 0-10V control signal. In this method, the voltage level between 0V and 10V determines the brightness level of the LED strip lights. LED drivers compatible with 0-10V dimming typically have a designated input terminal or control wire to receive the dimming signal.
  • DALI Dimming: DALI (Digital Addressable Lighting Interface) dimming is a digital dimming protocol used in commercial and architectural lighting applications. It requires a DALI-compatible LED driver that can communicate with a DALI controller or DALI dimming system. DALI-compatible LED drivers often have DALI input terminals or connectors to receive the digital control signals.
  • DMX Dimming: DMX (Digital Multiplex) dimming is a widely used digital control protocol in stage lighting and entertainment applications. It requires a DMX-compatible LED driver that can communicate with a DMX controller or DMX dimming system. DMX-compatible LED drivers typically have DMX input terminals or connectors to receive the DMX control signals.
  • LED Driver Quality

The quality of the LED driver, which regulates the electrical current flowing to the LEDs, plays a significant role in noise production. Low-quality or poorly designed LED drivers can introduce electrical interference and create buzzing or humming noises. It is best to get quality dimmable drivers or transformers to ensure optimum performance. 

At HitLights, we help professional installers, integrators, millworkers, contractors, and anyone who needs quality transformers in their lighting projects. Not only this, we also provide factory direct pricing that will save you both the trouble and reduce your project costing that’ll help your business grow. 

  • Improper Installation

Incorrect installation of LED strips can also contribute to noise issues. Poorly secured strips, loose connections, or inadequate grounding can result in vibrations or electrical disturbances, leading to unwanted sounds. This is typical due to the fluctuation of power that impacts the drivers performance that may result in noticeable buzzing or humming sound. 

  • Environmental Factors

Environmental conditions, such as excessive heat or moisture, can impact the performance of LED strips. High temperatures can affect the electronic components and cause them to vibrate or produce noise. Similarly, moisture or humidity can lead to corrosion or electrical shorts, contributing to buzzing or humming sounds.

Troubleshooting Steps

Now that we have identified the potential causes of buzzing or humming noises in LED strips, let's explore some troubleshooting steps to help you resolve these issues effectively.

  • Power Supply Troubleshooting
    • Check the Power Source

Begin by ensuring that the power source or outlet is stable and functioning correctly. Use a multimeter to measure the voltage and confirm that it matches the required specifications for your LED strip. One simple test to isolate this is by using a different device on the same outlet and test if that works.

    • Upgrade the Power Supply

If you are using a low-quality or underpowered power supply, consider upgrading to a higher-quality unit that matches the voltage and current requirements of your LED strip. Opting for a power supply with a built-in voltage regulator can help mitigate voltage fluctuations and reduce noise levels. The recommended load output to pair with a transformer should be below 80% of the driver’s wattage capacity. You can also check that out using our Power Supply Calculator

  • Dimmer Switch Compatibility
    • Verify Compatibility

If you are using a dimmer switch, check its compatibility with your LED strip. Consult the manufacturer's specifications or reach out to their customer support for guidance. Consider replacing the dimmer switch with a compatible model if necessary. You can refer back to the topic above about the types of dimming for a quick reference. 

  • Install a Bypass Capacitor 

In some cases, installing a bypass capacitor across the output terminals of the dimmer switch can help reduce buzzing or humming noises. This capacitor absorbs electrical noise and ensures a smoother current flow to the LED strip. This is only recommended if you are an electrician or familiar with installing one. 

However, instead of doing this, it might be best to isolate the issue by bypassing the dimmer switch and connecting the low voltage driver to the power source to check if the humming or buzzing sound goes off to identify if there is a possible incompatibility between the driver and the switch.

  • LED Driver Considerations
    • Upgrade the LED Driver

If you suspect that the LED driver is causing the noise issue, consider upgrading to a higher-quality driver. Look for drivers with features like electromagnetic compatibility (EMC) filters or active power factor correction (PFC) to minimize electrical interference and noise. 

  • Installation and Environmental Factors
    • Check Installation and Connections

Inspect the installation of your LED strip to ensure it is secure and free from any loose or dangling sections. Confirm that all connections are tight and properly fastened. Additionally, ensure that the strip is grounded correctly to minimize electrical disturbances. If you are using magnetic drivers, it will be good to use rubber gaskets. The gaskets act as a barrier between different components of the driver, absorbing vibrations and preventing them from transmitting as sound waves. By reducing the transmission of vibrations, rubber gaskets help to lower the chances of noticeable humming or buzzing sound from the driver. 

    • Control Heat and Moisture

Monitor the operating temperature of your LED strip and make sure it remains within the recommended range. Consider adding heat sinks or improving ventilation if the temperature is consistently high. Furthermore, protect your LED strip from excessive moisture or humidity by sealing it properly or using weatherproofing measures.


Buzzing or humming noises emitted by LED strips can be a nuisance, but with the right troubleshooting approach, you can effectively address these issues. By understanding the causes behind such noises and implementing the appropriate troubleshooting steps outlined in this article, you can enjoy the benefits of LED lighting without any unwanted distractions. Remember to prioritize safety and consult professionals if needed, ensuring a satisfactory LED strip experience in your living or working spaces.

If you need any help in troubleshooting further, feel free to reach out to us at or give us a call at 1 (855) 768-4135. Our team of expert engineers and electricians are here to assist you every step of the way! 

Leave a comment

All comments are moderated before being published