Best Light Temperature For Growing Plants

Last Updated on October 29, 2022 by Cinthia

Choosing the best light temperature for your plants growing needs is one essential factor in an indoor garden. As we know, grow light mimics the work done by sunlight and this must be done in the presence of the correct light temperatures.

Your plant will flourish when they are exposed to the appropriate light temperatures so this is why you must ensure you get it right. So, if you are wondering how to go about the best light temperature for your growing plants, we’ve got you covered.

We are all about easy indoor gardening. So, by the end of this article, you should have an idea of the right color temperature for each of your plant growth stages and more.

Best Light Temperature For Growing ...
Best Light Temperature For Growing Plants
What Is A Grow Light Color Temp?

Grow light color temperature is the accurate light spectrum provided by a grow light and is required for each plant stage. It is a means of showing the appearance of the light which is supplied by a light bulb. It is essential for a grow light to contain the necessary spectrum so a plant can grow healthily and adequately.

Light is known as electromagnetic energy which is measured in wavelength. This wavelength can be seen in various visible light colors waves that vary from red, blue, yellow, to green. Blue and red light are the colors mostly absorbed by plants for the photosynthesis process.

What Is A Grow Light Color Temp

The color of light supplies by a particular grow light is known as color temperature and it’s measured in Kelvin (K). The Kelvin has a scale that ranges from 1,000 (warm or red) to 10,000 (cool or blue).

Kelvin Color Temperature Scale

The Kelvin scale is a measurement of color temperature and it’s used to explain how different light temperature appears. Practically every light that comes with bulbs will be associated with Kelvin’s color temperature.

It is important you are enlightened on the various color temperature as this will help you in deciding the best lighting for your plants’ needs.

The Kelvin scale figures at the lower end offer a warmer color or hues of red. While on the other hand of the Kelvin scale where the figure goes higher, it offers a cooler color or hues of blue.

Why Is Grow Lights Color Temperature Important?

The importance of grow light color temperature cannot be overemphasized. They have a great impact on the growth of plants.

Take, for instance, the blue light is essential for vegetative growth. On the other hand, the red light is required for the flowering stage and fruit production. Therefore, the color temperature will assist in deciding the best light temperature for your plant’s growing needs.

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Light Spectrum Pigments

Plants contain various pigments they use in absorbing or reflecting certain light wavelengths. These pigments are used in the process of photosynthesis whereby plants make use of light energy to produce their food.

So, let’s take a look at some of two (chlorophyll and carotenoid) of this pigment involved in photosynthesis:

  • Chlorophyll: the green pigment contained in plants that allows them to manufacture their food is chlorophyll. They are the most abundant pigment found in plants and chlorophyll A is responsible for the absorption of light energy.
  • Carotenoid: the second most important pigment is the carotenoid. Carotenoids also help plants take in light energy, which in turn, transfers the energy to chlorophyll.

The Best Grow Light Color Temperature For Growing Plants

Choosing the right color temperature for the various stages of your plants can be determined by the values on the Kelvin scale.

Also, different grow lights are configured in various ways. Some grow light offers a full spectrum for your plants and will not require you to switch lights for different plant stages. Examples of such grow lights are the LED lights.

While some grow lights are not configured to be full spectrum. Thus, you will be required to switch these lights as your plant enters its various growth stages. Examples of such grow lights are the traditional lights such as fluorescent, HID, and so on.

The Best Grow Light Color Temperature For Growing Plants

Most of the LED grow lights have been we have in the market are configured to with full spectrum. Therefore, you can use the same light for all your plant growth stages. The only thing you need to do is position the LED grow lights distance to your plants’ canopy appropriately as they enter different growth stages.

So, let’s look at the required or best light temperature for your growing plants in their different growth stages:

1.    Best Light Temperature For Seedlings And Clones

The best color temperature for seedlings and clones is the blue spectrum. If you’re using the traditional grow lights, choose daylight bulbs that fall to the higher end of the Kelvin scale. Use 5,000 and above Kelvin figures bulbs for your seedlings.

We recommend you use fluorescent bulbs for seedlings and clones because they don’t produce too much heat. Your clones and seedlings are in their fragile state and need to be they need handles with care.

Other traditional lights such as HID light may also be used for your seedlings and clones. However, they produce a lot of heat. So you need to be extremely careful so they don’t burn your fragile plants.

2.    Best Light Temperature For The Vegetative Stage For Rowing Plants

The vegetative stage of a plant also requires blue lights which are at the higher end of the Kelvin scale. Just like seedlings and clones, vegetative growth should use bulbs ranging from 5,000 to 7,500 on the Kelvin scale. However, the lighting needs to be more intense for vegetative growth.

3.    Flowering And Fruiting Stage For Growing Plants

For the flowering and fruiting stage, your plant will require the red light spectrum which is at the lower end of the Kelvin scale. This light spectrum will encourage flowering, blooming, and fruiting.

Use light bulbs that range from 2,000 to 3,000 Kelvin values. HID lights such as high-pressure sodium (HPS) offer more of this red light spectrum. You can also use the LED full light spectrum for all plant stages.


Is Warm light or cool light better for plants?

In the case of growing houseplants, you should be aiming to use cool light. Cool light comes from a combination of the sun and air conditioning. The sun produces light that is predominantly yellow-orange, with a very slight blue tinge, and the air conditioning adds red and far-red wavelengths.

Cool light is best for plants because it mimics sunlight, which they need to grow. The sun produces both warm light and cool light. Warm light is a combination of both blue and yellow wavelengths. Q: Do you know how to grow indoor plants in winter? A: Yes. You can grow houseplants i

Is 5000 Kelvin good for plants?

Yes, 5000K is enough for most plants. But don't use 5000K as the maximum. You can get some plants that flower really well under 2000K, such as geraniums and some begonias. There are many other plants that need a higher light spectrum. If you want to grow plants indoors, then your best bet is to set your LED to about 5500K, but not at full power. If you do this, then you can turn the lights off for 4-8 hours at night, which will give you enough light to get by without turning on the lights. Then you'll have a nice light spectrum in the middle of the day.

Will LED lights help plants grow?

One of the biggest questions that people have about growing plants indoors is whether it's possible to grow plants in an LED light. The short answer is yes, you can, but there are some things to consider before you make the switch. 

It's not as simple as just putting a plant in an LED light and leaving it there all day, because not all LEDs produce the same amount of light. A lot depends on the type of LED bulb used, the wattage and the number of bulbs used. There's also the matter of how far away your plants are from the bulbs.

Does regular LED light help plants grow?

These lights have different wavelengths that affect plant growth. Red light stimulates photosynthesis. Blue light promotes cell division. White light is a mixture of red and blue. Now, we can use all three colors together to create the spectrum of light. There are many types of LED lights. The most common type is the LED strip. It has red, blue, and white LEDs. We can also put them in groups. For example, we can use a single red LED on one side of the plant and a single white LED on the other. This will make it easier to grow plants.

Best Light Temperature For Growing Plants: Final Words

We can see now that light temperatures are essential for plants development. So, ensure you choose the best light temperature for your plants growing needs for all of their growth stages.