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Plant Grow Light Flickering: 5 Sure Reasons with Solutions

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Are you noticing that your plant grow lights are flickering? It can be a frustrating experience, and it’s important to understand why it’s happening so you can fix the issue.

Grow lights will flicker when there are fluctuations in incoming voltages, it’s connected to an overloaded circuit, there is loose wiring, or the driver itself is faulty.

An inconsistent light source can affect photosynthesis, directly affecting the plant’s overall health.

In this article, we’ll discuss the causes of LED flicker in grow lights and how to prevent it. We’ll also explain how flickering light could affect your plants and when you should replace your grow lights.

What Causes Grow Lights to Flicker?

artificial lighting for plants

You may be wondering why your LED grow lights are flickering. 

It could be due to under-voltage, loose wiring, or having the grow lights on the same circuit as other appliances, and in many cases, other lights at home will also be flickering if they share a common source of power.

A faulty LED light driver or an inferior product could also cause changes in the lighting pattern. 

We will discuss each of these possibilities in more detail.

Under Voltage


When the voltage supplied to an LED is too low, it’ll flicker like a firefly in the dark–dim and unsteady. This phenomenon is called ‘under voltage’ and can be caused by factors such as power surges, inadequate wiring, or a faulty driver.

If your grow lights are flickering, it’s most likely due to under-voltage. Under-voltage can cause more than just flickering; it can also affect the lifespan of your LED grow light. 

When the voltage supplied is too low for an extended period of time, your grow light will have a shorter life than if it was operating on its ideal voltage range.

Fortunately, there are ways to prevent this: use surge protectors and ensure that wires are connected correctly and securely throughout the system. 

You should also ensure you’re using an appropriate driver for your LEDs; drivers that are too powerful or weak can cause significant damage to your system over time.

Faulty LED Light Driver

LED driver

A faulty LED light driver can significantly damage a lighting system, potentially leading to reduced longevity and unsteady illumination.

An LED light driver is used to regulate the power that’s delivered to the LEDs, ensuring they operate correctly and safely. 

If it fails or is working improperly, you’ll experience flickering of your plant grow lights.

This can be caused by power fluctuations, voltage spikes or drops that are too large for the driver to compensate for, sudden changes in current draw from other devices on the same circuit, failure of components within the driver itself, worn-out capacitors or transistors, and bad connections between components.

When this happens, you should replace your LED light driver as soon as possible to avoid further damage and ensure optimal performance of your plant grow lights.

Grow lights on the Same Circuit as Other Appliances

Overloaded circuit

If your horticultural illumination is experiencing any jitters, it could be due to other electricals on the same line.

Having multiple appliances and grow lights on the same circuit can cause flickering in your plant grow light. 

This can happen because the current draw of the other appliances is momentarily taking up more power than what’s available, so when the current draw drops again, there isn’t enough to maintain a steady flow through the LEDs.

To ensure consistent lighting for your plants, make sure all of your grow lights are connected to their dedicated circuit and that they aren’t shared with any other appliances or devices.

If you have multiple circuits in use, it’s also a good idea to stagger them so that each appliance has its own separate timeslot for drawing power. That way, you won’t experience any issues with flickering or dimming!

Loose Wiring

Loose wiring

Loose wiring can cause your horticultural illumination to act up, resulting in unsteady lighting for your plants.

If wires are not securely attached to the light fixture or the power source, then it could lead to flickering or dimming of the grow light when other appliances are also running on the same circuit.

Loose connections can prevent a steady flow of electricity from reaching the bulb and thus cause an intermittent glow.

To ensure that your plants get consistent lighting, check all wiring connections and ensure they are secure and snugly fit at both ends. 

Furthermore, use quality electrical connectors and if you’re unsure about any part of the installation process, hire a professional electrician to do it for you – it’s worth having peace of mind knowing that everything is connected safely and correctly.

Inferior product

Inferior Product

You don’t want to skimp on quality regarding your horticultural illumination, or else you’ll be left in the dark. Plant grow lights that are of an inferior product can lead to flickering and other unwanted issues.

Here’s why:

  • LED drivers need to be designed for the specific purpose of providing power and current control for LEDs.
  • Poorly made LED drivers may not be able to regulate current output which can result in flicker properly.
  • Inferior components such as capacitors, resistors, voltage regulators, etc could all contribute to flicker due to their inability to meet required standards/specifications.
  • Poor design choices regarding thermal management may also cause flickering as heat build-up can cause components not to function correctly, leading to inconsistent output.
  • Low-quality LEDs themselves are prone to failure after a short period due to their lower level of resistance against voltage spikes and drops or even heat dissipation problems leading again to flickering.

You must only use high-quality parts when assembling your plant grow light system if you want it to work optimally and free from any unwanted issues like flickering!

Will Flickering Light Affect Plants

When it comes to your plants, you may be wondering if that flickering light could affect them in any way. The answer is yes, it can.

Flickering light can cause stress to the plant’s photosynthesis process, which can lead to stunted growth and a decrease in overall health.

An inconsistent light source also interferes with the plants’ ability to absorb nutrients from its environment, leading to deficiencies that can further inhibit growth and development.

Additionally, the constant changes in the intensity of the light can cause damage to the plant’s cells over time.

Fortunately, modern LED drivers are designed specifically for this purpose and reduce or eliminate flicker altogether, so you don’t have to worry about these issues affecting your precious plants!

How to Stop Grow Lights From Flickering

Now that you know the potential effects of flickering light on plants, it’s time to learn how to stop grow lights from flickering.

Here are five easy steps for preventing and eliminating flicker in your plant-growing setup:

Use a quality LED driver

A quality LED driver is designed to power LEDs and prevent them from switching on/off rapidly. Make sure to purchase a driver with the right wattage for your needs.

Invest in dimmable fixtures.

Dimmable fixtures give you more control over the brightness of your lights and help reduce flicker.

Utilize Pulse Width Modulation (PWM) – PWM allows you to adjust the voltage of your lights, which helps minimize any perceived flicker.

Select lower CRI bulbs

Bulbs with a higher Color Rendering Index (CRI) tend to flicker more than those with lower ratings. Consider using bulbs with lower CRI ratings for optimal results.

Choose an appropriate frequency

The frequency of your lighting system should be compatible with whatever type of driver or fixture you’re using. If possible, opt for a model that has adjustable frequencies so you can further fine-tune its output.

Following these simple steps ensures that your plants receive consistent light without experiencing any adverse effects from unwanted flicker.

When to Replace Grow lights

It’s important to know when to replace your lighting setup, as it can have a big impact on the health of your plants; after all, they could be exposed to up to 50,000 hours of light over their lifetime!

The lifespan of grow lights is usually between 25-50 thousand hours, depending on the type and quality. If you’re using LEDs, they tend to last longer than other types.

When replacing a grow light fixture, remember that lower-wattage LED bulbs will typically consume less energy than higher-wattage incandescent or fluorescent bulbs and are more efficient at converting electricity into visible light.

Replacing a grow light is no small task, but it’s necessary in order to ensure that your plants receive the best possible light source for photosynthesis and growth.

You should check the condition of your lights regularly for signs of flickering or dimming; these are indications that it’s time for a new one.

Also, pay attention to how long it takes for your plants to reach maturity, as this can tell you if they’re not getting enough light from their current setup.

It pays off in the end when you invest in reliable lighting equipment, so make sure you replace yours before any major problems arise!

Best LED Grow Lights For Plant From Amazon

With a wide variety of sizes and colors to choose from, it can be overwhelming trying to find the perfect product for your garden. To help make the process easier, we’ve put together a list of some of the best LED grow lights available on Amazon.

The AMBOR Grow Light is one of our favorites due to its full spectrum design, which provides optimal balance between blue and red wavelengths.

Its powerful LEDs are extremely efficient and use 95% less energy than traditional HID lamps while providing up to 4x more coverage area compared to other brands.

For our indoor plants, we use AMBOR Grow Lights; it is an effective and durable artificial grow light we found on Amazon that provides the right spectrum of light that allows our plants to grow to their full potential.

grow light

Additionally, this light is designed with an advanced cooling system with thick aluminum heat sinks, which help dissipate heat quickly and keep temperatures low without any extra noise.

Plus, its superior construction guarantees no flickering or buzzing even after extended periods of use so you can be sure your plants get all the necessary light they need without any interruption!

Frequently Asked Questions

What is the difference between LED and other light sources?

LEDs are the most advanced light source on the market, and they have many advantages over traditional bulbs, such as incandescent, halogen, and fluorescent.

They do not flicker like traditional lights because they are powered by LED drivers that are designed for this purpose.

They produce a more consistent light output than other sources, making them ideal for any lighting application.

Additionally, they use less energy than other types of lights, making them an environmentally-friendly choice.

What are the benefits of using an LED driver?

Using an LED driver to power your LEDs has many benefits. It eliminates the flicker you get with other light sources, such as incandescent, halogen, and fluorescent. 

LED drivers are so efficient that 98% of energy is converted into light! That means you get maximum brightness for minimal energy usage – a win-win situation for both your wallet and the environment.

LED drivers also protect your LEDs from voltage spikes or power surges due to their built-in protection circuitry. 

So you get reliable performance and peace of mind knowing that your investment is safe too!

Considerations when using LED grow lights?

When using LED grow lights, it’s important to know the potential safety considerations. LEDs generate heat, and some can get quite hot to the touch.

It’s also important to ensure your LED driver is properly rated for your usage – an over- or under-powered unit can cause unsafe conditions.

Be sure to use fixtures with proper ventilation, and always use a certified electrician when wiring any electrical components.

Finally, check with local building codes in your area before installation as there may be additional regulations you must abide by.

Are LED grow lights more energy efficient than other light sources?

LED grow lights are a great choice for efficiency. They use less energy than other light sources and still provide plenty of light. You can think of them as the ‘jack of all trades’ in lighting. They save energy, last longer than traditional bulbs, and don’t flicker like incandescents or fluorescents.

So, if you want to reduce your energy costs while keeping your plants happy and healthy, LED grow lights are the way to go.

The Takeaway

You’ve learned much about LED grow lights and how they can flicker. Flickering lights can affect the growth of plants, so it’s important to make sure you have the right lighting setup for your indoor garden.

According to research, LEDs are up to 20% more efficient than other types of grow lights and last up to 10 times longer. 

So, by investing in quality LED grow lights, you’re protecting your plants from flickering and saving money in the long run.

With that said, take the time to find the best LED grow light for your needs and enjoy watching your plants thrive!

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