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Do LED Grow Lights Work?

Do LED Grow Lights Work?

LED grow lights work well when you use them as intended. That means utilizing the proper intensity for your plants, hanging your light at the proper height, and giving your plants and lights a chance to rest after 18 hours of use.

With LEDs being a somewhat new technology, some old school growers may still be skeptical or curious if LED grow lights work. You don’t need to look far to determine the answer is a resounding yes.

What Are LED Grow Lights? Do They Work For Indoor Gardening?

What are LED Grow Lights?Light Emitting Diodes (LEDs) are electrical devices that emit a spectrum of energy efficient light that can stimulate plant growth.

The spectrum of light they emit may be similar to the sun’s or have certain light spectrums that may stimulate plants at different stages of growth.

LED grow lights can be used as the sole source of light for plants or as a supplement. This is the factor that makes it possible for people to have indoor vegetable gardens.

How Do LED Grow Lights Work?

LED grow lights use two different types of semiconductor materials to create their own spectrum of light. The first semiconductor has negative charges –electrons-, whereas the second one has positive charges called holes.

They pass light energy through semiconductor chips to emit their spectrum of light unlike other grow lights which use filaments, gas, mercury or lead to produce light.

In comparison, LED grow lights are energy efficient, versatile and more durable than incandescent lights. In addition, they also better for the environment.

Is LED light good for plant growth?

Why are LED grow lights Good for Plants?

When people say light, they usually refer to the part of the electromagnetic radiation spectrum that is visible to their eyes. However, there are certain wavelengths the human eye cannot detect that are very important for plants.

Such wavelengths that play a role in photosynthesis are known as photosynthetically active radiation (PAR). Different wavelengths within PAR stimulate plant growth or flowering at different stages and for different plants too.

The intensity of the light when it finally touches the plant surface is called Photosynthetic Photon Flux Density (PPFD). Ideally your grow light will have a strong PPFD value from 460 to 925 across your whole canopy.

By using LED grow lights, even people living in cities without yards can partake in some indoor gardening and produce food all year round. It is therefore imperative for people to be mindful of the food they eat. Gardening is a good way for people to control the quality of food they eat.

Factors To Consider When Choosing An LED Grow Light:

If you are planning to buy this kind of grow light, there are a few things that you should keep in mind. Watch the video below, or skip straight to my list of the best LED grow lights for plants.

How To Choose The Best LED Grow Light For Growing Weed (Cannabis) At Home

Light Spectrum:

LED grow lights emit different wavelengths which stimulate plants at different stages for various reasons. Therefore, one should consider the sort of stimulation they want for their plants before choosing a set.

Different wavelengths facilitate various aspects of plant growth such as vegetation, flowering or growth of roots. As an example, LEDs that are perfect for growing tomatoes may not be as effective with flowers.

If the LEDs required are needed to cater for the plant at various stages, there is an option of purchasing a full spectrum LED grow light or an adjustable one. A full spectrum LED grow light emits a range of wavelengths similar to the sun.

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This makes them useful for all sorts of plants at all stages. Adjustable LED grow lights can tuned to emit different wavelengths to stimulate plants at different stages. The ability to vary the light output enables people to choose the wavelength necessary at any given stage.

Grow Space Size vs Grow Light Coverage Area:

The size of the planting area dictates the size and number of lamps needed. After determining the size of the garden, one should consider the area each lamp can light to be able to calculate the number of lamps that will be needed.

Normally, 32 watts of actual power are needed for every square foot when planting high-light dependent plants such as tomatoes.

Plants such as lettuce that do not require as much light can thrive with 11-18 watts of actual power per square foot.

Heat Output:

The heat output of a grow light is important as it can directly affect the plant and it also plays a role in the lamps’ durability.

Grow lights are normally mounted in close proximity with plants. Therefore, a high heat output will be counterproductive as it will damage the plant.

Grow lights with cooling fans or heat sinks are the best as they have no negative effects of the plant and allow even closer mounting. This can be very important for a vertical garden as it will enable farmers to have more layers for planting.

A low heat output lamp will also last longer as it will take more time to burn out and hence won’t need to be replaced within a short period.

Advantages of Effective LED Grow Lights:

Energy Savings:

LED grow lights can consume up to 60% less energy than other lighting systems to emit the same amount of light. In addition to their energy efficient nature, they also emit less heat. This is because they do not burn anything to produce light.

Though LED lamps cost slightly more than traditional grow lights, their durability and efficiency makes them cheaper in the long run. In addition, the ability to produce quality produce all year round from within your home is worth the spend.

I’ve written an expert guide on the Best LED Grow Lights so you can pick the model that’s right for your situation.

Plants that grow better:

Alternative light sources emit more UV rays, IR rays and more heat which is cause plants to burn and dry up. With LED grow lights, these components that are counteractive to plant growth are significantly reduced. Therefore, plants grown will thrive rather than just survive.

In addition, some LED grow lamps allow people to adjust the wavelength of light emitted to ensure plants receive more of the needed spectrum of light. This will boost the all-around health of the plants.

Faster Growth Cycles:

Plants that are grown indoors without the exposure to environmental cues do not follow regular planting seasons. With LED lights, one can provide different wavelengths of light to facilitate different plant processes for 24 hours a day.

This allows the farmer to influence the behavior and season of the plants. When using LED light on auto-flowering plants, growers can influence flowering times in plants to increase production. This creates the possibility of having multiple harvests in one season.


Traditional lighting systems burn filaments, gas or other elements to produce light. The amount of heat they produce greatly reduces their durability.

The low heat output of LED lamps significantly increases their lifespan. In fact, they can last up to 50,000 hours. They are more convenient for growers as it will take years before an LED lamp will need to be replaced.

Where to buy LED Grow Lights That Work Well:

The best place to purchase an LED grow light is Amazon or LED Grow Lights Depot. The reason is that they both offer huge selections. Each grow light is described in detail, and easily compared to others.

The most modern grow lights available are COB LEDs and Quantum Board LEDs – you can read my articles about them here (COBs) and here (Quantum boards).

Otherwise feel free to check out our home page and read reviews for the best regular LED grow lights that are generally more affordable.

Here at we spent an enormous amount of time comparing and contrasting LED grow lights of all sizes in the hopes that you’ll find the right one for your specific setup.

Once you determine a light that’s right for you, click through one of the links and make your purchase. These grow lights work well for marijuana (cannabis) plants, but they also work well for regular house plants.



My name is Nick, and I'm a home grower who spends time writing about indoor growing tools and setups. My goal is for 420ExpertGuide to be a one stop shop for indoor growers to find the information they need.