What are the Effects of LED Grow Light Wavelengths on Plants?

Compared to we humans, plants make use of light from sunlight in a different way. Over the years, several scientists continue to research and examine the way plants respond to different light wavelengths. With on-going research, the technology that most LED grow lights use continues to advance in wavelengths. Scientists often believe that when growers understand the role that LED light wavelengths to play, their ratios and intensities on plants could help to know how plants respond to light as well as how their metabolism would lead to a revolution in indoor gardening.

If you consider taking up hydroponic gardening, then you should know that providing sufficient light for plants indoors could turn out to be a complex aspect for growers. You need to know that light has the power to push the photosynthesis process, which provides sufficient energy in turn for the development and the growth of plants. However, just some growers fully understand how the manipulation of light wavelengths and the spectrum has an effect on various stages of the growth of plants.

As an amateur grower, you need to know that the spectrum of light has different effects on the way plants respond and proceed with photosynthesis, photomorphogenesis, and photonsaty. However, when talking about this at a biochemical level, botanists, and researchers realize that certain wavelengths of light actually influence some factors like the resistance to pests, diseases, and flavor, the color of the plants, aroma, and much more. Manipulating the spectrum of light for plants indoors, along with hydroponic growing comes with the chance to grow plants in the right ways to ensure the best yields.

The Nature of LED Light Energy Wavelengths

Majority plants grow well under lights with full spectrums. In general, plants use red and blue bands of light for photosynthesis, especially during their flowering stage. LED grow lights often come with electromagnetic spectrums that have a mixture of various other wavelengths, as well as yellow, violet, green, blue, red, and orange. The length of these colored lights determines their energy, hence, the higher the spectrum, the shorter the wavelengths will be.

The Light Wavelengths and Photosynthesis

Usually, plants make use of wavelengths that are between 400-700nm for photosynthesis. These wavebands are the photosynthetically active radiation (PAR) and this why grow lights have this measure of light, often the “PAR” Watts. Most lights like Dorm Grow LED lights have a full spectrum, which provides the right type of wavelengths, almost similar to sunlight, and they are a preferable choice among indoor growers.

Using LED grow lights, most growers can now avail the choice to customize their indoor lighting systems to ensure it suits the needs of specific plants and enhances their growth stages. These lights help to alter the metabolism process of plants to functionalize the manufacture of food. These lights also use various wavelengths of light to induce higher and better concentrations of antioxidants in some fruits and vegetables. They help to increase the bioactive compounds in medicinal plants, which enhance the sweetness and flavor.

The Effects of Blue and Red Wavelengths

The red wavelength of light, often ranging between 650-665 nm fits well with the absorption peak of the chlorophylls in plants, and this offers more energy for photosynthesis. However, red light alone can just lead to unbalanced growth and elongation of the plant. Adding some percentage of blue light will help in boosting the energy that is available for the photosynthesis process. It prevents the plant from excessive stretching and leads to balanced vegetative growth.

In general, plants have different blue and red receptors that control different plant aspects in the development and stage of growth. In some ratios, the wavelengths of the light help in plant metabolism. The red light between 658 and 600 nm will help to increase the antioxidant content in some vegetables like lettuce and cabbage. On the other hand, in cannabis, blue and red wavelengths will boost the yield by about four times more, and trigger a faster process of flowering.

For growers who proceed with large-scale projects, customizing the LED grow lights with the right blend of light ratios will play a major role when it comes to achieving the growth of certain species of plants. As days pass by, gardening indoors, even when the weather is unfavorable will not come to a halt. Growers can easily rely on smarter lighting options for optimum results.


The initial cost of LED grow lights compared to previous options is much higher, but you should know that in the long-term, this would prove to be a better and smarter choice. Beyond that, it doesn’t take much for these lights to pay themselves in the best ways. As a wise grower, you have to look past the price of purchase for the equipment and consider the total ownership cost.  Before you make the investment, you have to consider which option is better for you by consulting experts and understanding the size of your grow space.