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Effects of Blue Grow Light on Indoor Plant Cultivation

To grow plants indoors, it is essential to use blue grow lights, as it is vital for the photosynthetic process of the plant,  promoting both growth and flowering.

Blue light, along with red and green light, make up part of the spectrum of light emitted by the sun. Therefore, artificial light sources used to grow in enclosed spaces should include them. This is a fundamental element  for  indoor plants as the combination of lights provide benefits similar to those offered by natural light.


Currently, the most used artificial light source by those who are dedicated to indoor  or greenhouse cultivation, are LED lights (Light Emitting Diodes) provide the greatest advantages, compared to the other existing light sources.

LED lights allow for growing even when the season of the year  is not favourable.  With LED lights, it is possible to keep the plants in optimal condition, even  with an absence of sunlight. 

Below, you'll learn a little more about the function of blue grow lights and how they intervene in plant growth, why LED lights are the best choice for growing indoors,  and the benefits of blue light for cannabis.

What Does Blue Grow Lights Do to Plants? 

Blue grow lights are absorbed by plants to stimulate the photosynthesis process, thus allowing it to grow and flower properly.

When we decide to grow plants indoors, it is necessary to find an alternative light source and provide adequate temperature and humidity, so that we mimic a suitable outdoor environment that our plants can thrive in. In the case of an alternative or artificial light source, LED lights are prime for cultivation. With them, you can use  the lights of the color that your plants need, according to their growth stage with a flick of the switch

Applying blue grow lights during the early stages of vegetative stage is ideal for improving your plant’s structural quality, as it will help:

  • Establish the roots.
  • Strengthen the stems.
  • Increase the density of the leaves.
  • Stimulate the opening of the stomata.
  • Makes chlorophyll absorption easier so that the process of photosynthesis begins.
  • Regulates stem stretching in mature or adult plants.

Seedlings-of-marijuana-in-small pots

These benefits undoubtedly contribute to the preservation of solid and healthy plants. 

Blue Grow Light for Leaves

Blue grow lights positively affect the leaves of plants. It is known that plants exposed to this specific type of light, usually have greener, thicker leaves,  and are greater in density.

This is because blue grow light on leaves, promotes:

  • Good quality of the leaves.
  • Production of antioxidants and vitamins.
  • Creation of compounds for the coloring of leaves.


The lack of blue light, in some plants, can produce lesions or malformations in their leaves and stems. Therefore, it is essential to use blue light to get a healthy and vibrant plant.

Regulation of Flowering with Blue Grow Lights

Blue light applied at a greater intensity than provided by natural light, comes to stimulate flowering in plants with prolonged flowering. While in short-flowering plants it is reduced.

This information is ideal to use to your advantage. You can force your plants to bloom in less time, without having to wait for their normal flowering cycle, or you make them not bloom so quickly, if it is short flowering.

Does Only Blue Light Help Plant Growth?

The answer is No!, Although blue light helps the growth of plants in their early growth stages, you will need the benefits of red and green light as well.

To achieve adequate growth of our plants we will need, first, blue light to strengthen roots and stem; and subsequently, red light will be needed to stimulate photosynthesis and flowering, especially for the formation and growth of biomasses.

On the other hand, green light, used in a smaller proportion than blue and red light, has importance in the process of growing crops, especially in those that are carried out in completely enclosed spaces where you do not have access to natural light. Although the absorption of green light isn’t as dominant as blue or red, it is suggested that green light promotes healthier flower development.

Why LED Grow Lights are the Best Choice for Indoor Growing?

Without a doubt, LED grow lights are the best option not only for the growth of indoor plants but also for the environment. They leave behind the use of traditional light sources such as incandescent bulbs or compact fluorescent lights. The use of LED lights will benefit your growth as well as save you money!


A few of  the benefits provided by LED grow lights:

  • It provides a full spectrum of light, very similar to that of sunlight.
  • The lights can be adjusted to the needs of the plant according to its stage of growth.
  • They are low energy consumption lights and emit little heat, making them environmentally friendly. 
  • The same LED can be used for different species of plants.
  • They are less expensive  compared to the prices of common HPS lamps.
  • You can easily install and manage them yourself.
  • They are durable, since the wear and tear of their use is very minimal.
  • Plants are not at any risk during use.

Advantages have made LED lights the best option when growing indoors, both used as a single source and complementary.

Light Spectrums by LED Grow Lights

Although LED grow lights produce a full spectrum of light, most are inclined to use the wavelengths of the PAR (Photosynthetically Active Radiation) range, which tells us, between which colors of light the photosynthetic process of plants is considerably increased. PAR is necessary in plants for photosynthesis.

The frequently produced light spectrum provided by an LED grow light are blue, red, and green.

These three colors of light, some used to a greater or lesser extent, are indispensable to carry out photosynthesis adequately .

It is also known that there are some plants that can have positive interactions with other spectrums outside the PAR range contributing to healthy growth. Among them are ultraviolet and Far red.

Therefore, the best thing you can do when growing plants indoors is to know the special spectra for your type of plants and get a full-spectrum light source that can offer the best conditions for growing healthy plants.

Benefits of Blue Grow Lights for Cannabis

Blue grow lights for cannabis are essential. Their interaction during the early stages of growth, help to strengthen the plant's roots. It stimulates the growth and hardens of the stem, to prevent it from bending, breaking, or withering.

Blue light can increase the size and density of cannabis leaves, as well as in its properties and appearance, helping to produce healthier leaves.

Once the first stages of growth have occured,  it is ideal to continue exposing cannabis plants to blue light. In the following stages, it helps regulate growth of their stems and promotes flowering encouraging a healthy fruitful plant

A flowered-cannabis-plant

This regulatory benefit offered by blue grow lights is very important when growing cannabis at home. Although it is completely legal to consume and cultivate this plant in some  countries, it does not hurt to do it discreetly, without harming or disturbing the people around us.

Therefore, the ideal is to look for the necessary tools and indications that help us grow cannabis plants with excellent quality and with the least possible problems.

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