Updated at: 20-10-2022 - By: Sienna Lewis

Choosing the right color of light to grow plants in a greenhouse is an important consideration. The plants in your greenhouse would benefit from more than one hue of light; these colors are blue and red.

While these are the most common color lights for plants, they aren’t the only ones available. Because they are near to the spectrum that plants commonly employ, blue and red light is the ideal color light for developing your healthy plants in the greenhouse.

Green and yellow light, on the other hand, can be beneficial to your plants. So, which spectrum of light should a greenhouse employ for growing plants? We’ll find out!

Color Light For Your Plants

If you’re a gardener, it’s important to know that plants can grow in almost any color of light. What matters most is how much or how intense each color is, rather than what color of light is being used to grow your plants.

While growing plants in a greenhouse, the gardener is responsible for ensuring and monitoring the correct hue of light, in addition to other factors like temperature.

What Color Light Would Be The Best For Growing Plants In A Greenhouse - Krostrade

Your greenhouse’s climate may be controlled, allowing you to create an appropriate setting for your plants, no matter where you are and what kind of weather you’re dealing with.

Best Color Light For Growing Your Plants

Choosing the right color of light to grow plants in a greenhouse is an important consideration. Green, yellow, and orange lights are commonly used by gardeners because they believe that they are part of the same spectrum as the sun emits.

We are attempting to replicate the ideal greenhouse conditions that your plants need to thrive.

Recent research shows that your plants’ photosynthetic activity occurs at frequencies in the blue and red ranges of the electromagnetic spectrum.

It’s best to use red and blue lights because these hues absorb the most chlorophyll, which is helpful to plants.

To develop your blooming plants in a greenhouse, you must know that there are a variety of lights and colors that may be used.

These plants thrive under full spectrum LED grow lights, even though blue and red are great colors to utilize for growing these plants.

LED compared to fluorescent

Choosing the right color of light to grow plants in a greenhouse is an important consideration. The blue light emitted by a fluorescent bulb will encourage your plants to grow taller.

As a bonus for seeding your plants, fluorescent lamps don’t produce a lot of heat, which is critical when caring for your plants in the greenhouse.

With a fluorescent light, you can choose between a warm white or cold white light for your plant’s growth (with more blue color in it).

While fluorescent bulbs utilise wavelengths that LED lights don’t, LED lights are more energy-efficient and long-lasting.

In addition, LED lights make it easy for owners, farmers, and gardeners to select the true color spectrum, which fluorescent bulbs cannot supply.

In light of this, the following information will go over the various colors and their effects on your wonderful plants as they develop in your greenhouse.

Blue color

Keep in mind that when using blue light, gardeners must remember to blend it with different spectral lamps.

Depending on your plants’ sensitivity, energy uptake, and hue, blue light can cause growth stunting and other problems for them.

You may help your plants grow and mature faster and reduce their overall water waste by using a low intensity of blue light.

Red color

Red light has a similar effect on plant growth in a greenhouse. If you want healthy, well-developed plants, it’s best to use a combination of red and blue.

The color red is beneficial to your plant’s growth since it plays a major part in seed germination, the expansion of leaves and stems, and in the flowering stages.

Green color

Because of its low efficacy, gardeners prefer to overlook the hue green when choosing lights for their plants.

Researchers from Michigan State University say green is still useful in photosynthesis and plant structure, especially when grown inside a greenhouse.

By utilizing the green light, even large, overhanging greenhouse canopies can receive enough green light to support photosynthesis in the lowest portions of their leaves.

Light Intensity Vs. Color Of Light

No, the strength of light is more significant than the color of light while growing plants in your greenhouse. As a follow-up to understanding the color spectra, it is essential to understand the importance of light intensity while growing healthy plants in the greenhouse.

Your plants’ photosynthetic rate will increase if the light intensity is increased.

Because greenhouse glazing reduces the amount of light accessible to plants for photosynthesis, it is critical that you install grow lights in your greenhouse.

What Is DLI?

DLI is a phrase you may come across while researching grow light color temperature. When it comes to photosynthesis, this word offers you an indication of how much light the plant will have at its disposal. Photosynthesis is the process by which plants obtain energy from the sun.

It is beneficial to utilize grow lights in greenhouses since they boost the DLI. It is the plants’ productivity that will determine the rate of growth. Nevertheless, you must also be aware of the right distance between a light source and the plants it illuminates.

Depending on your greenhouse business, you may utilize fluorescent, LED, or high-intensity discharge lights. Maintain a gap of up to 30 inches above your plants if you’re utilizing LED lights. High-intensity discharge lights, on the other hand, can be placed up to eight feet above the plants with only a six-inch clearance over the foliage.

Is Light Intensity Important For Growing Plants In A Greenhouse?

In the greenhouse, light intensity is an important consideration after learning about color spectra. In general, the more intense the light, the more photosynthesis will occur. Because greenhouse glazing reduces the amount of light accessible for photosynthesis, it is critical that grow lights be installed.

What Light Color is Best for the Plant's Growth? - Plants Craze

Significance of a grow light

Photosynthesis, the process through which plants obtain their energy from the sun, relies on the presence of light. Growth of plants is aided by light in conjunction with nutrient-rich soil and an adequate supply of water.

Using grow lights to replace the sun’s beams is a good idea in northern climates or greenhouses with little daylight exposure. If there isn’t any natural light during the winter, utilize grow lights to illuminate your greenhouse or to get to those hard-to-reach places. Grow lights can also be set up after sunset to extend the amount of daylight for your plants throughout the winter months.

The quantity of daylight in each region of the country varies. The best course of action is to put in a timer for all of your lights. As the seasons change, you’ll be able to save money on your electric bill and extend the life of your bulbs.

Which kind of grow light do you need?

Lights have different effects based on their color. Photosynthesis is affected by blue and red light in distinct ways. Cool blue light, as the name suggests, promotes bushier, more compact growth. On the other hand, red light stimulates the production of hormones, making it ideal for growing flowers and fruits. Grow lights are typically orange or reddish in color because greenhouses are the most usual place to use them.

Prices, forms and sizes fluctuate widely when it comes to grow lights. There are 30 dollar lights that work best when put 24 inches away from the plant, but if you move it too close, you risk damaging your plant by transferring heat from the light. With a clip handle, you can simply change the spot to the plants who need it the most, and many of them have a life span of fewer than 1000 hours.

Fluorescent grow bulbs fall into the second price range. They save money and are easy to put in. Up to 20,000 hours can be expected from a fluorescent bulb. The blue wavelengths of fluorescent light are ideal for seed beginning, so keep that in mind while planning your setup. With these lights, the seedlings can be put as close as possible to the source of the light’s heat. A new type of fluorescent light produces red light and allows flowers to bloom. Pay attention to the spectrum of light that fluorescent grow bulbs emit when you buy them.

LED technology is a new type of grow light, and its smallest size is its most crucial advantage. In order to provide the plants with the maximum amount of both blue and red light, LED lights are used. Plants can be placed as close as possible to these lights because they don’t emit any heat.

Despite the fact that your plants require a lot of light, they also require a certain amount of darkness. To get the most out of your plants, you’ll want to give them at least six hours of darkness each day, so do your research before buying and installing grow lights.

Using Grow Lights for Seedlings or Indoor Plants ~ Homestead and Chill

Getting started

To begin, make a list of your objectives. There is a possibility that you are starting with seeds and eventually need a year-round structure. Do you already have fruit-producing plants that you’d want to help grow? What kind of weather and how much sunlight does your greenhouse get in the autumn and winter months? You can’t beat stepping into your greenhouse in January to be welcomed with the sight and aroma of vibrant plants in active growth.


It may be difficult for some people to maintain optimal and ideal conditions in their greenhouse, but it is still possible for everyone.

Also keep in mind that the mix of blue and red lights is optimal for your growing plants because these colors are the most important for plant growth, stability, and structure.

When growing plants in a greenhouse, it is critical to know how much or how much intensity of light each hue requires.

It’s up to you or the plant to decide what color of light is appropriate for illuminating plants in a greenhouse. Thank you for taking the time to read this, and we hope to see you around again soon!