When utilizing LEDs as sole-source lighting, one of the most important decisions is to determine the light spectrum to obtain the desired plant responses. The spectrum for LEDs is determined by the number and different colors (wavelengths) of the LEDs.


LEDs have the potential to regulate plant branching, plant height, and flowering time. Thus, customized light spectrums have the ability to regulate a wide range of plant processes—including germination, extension growth, branching, and flowering—depending on the ratio lighting to crops. The sun emits a full spectrum of lighting. LEDs can be customized for plants grown indoors. These plants aren’t surprisingly different from those grown with sunlight.


As you adjust the proportion of LED lighting, stem length, leaf area, and crop production increases. In addition, the flowering of some long-day plants is accelerated when you combine the right type of lighting spectrums. Thus, the absence of proper lighting in the light spectrum can suppress shoot growth and delay crop development in some crops.

What is a Color Spectrum?

Plants naturally grow in sunlight, which appears to our eyes as white light or yellowish-white light. This light looks white because it contains all of the colors of a rainbow, and when these colors are all mixed together they look white. When broken down out of that combination, each color represents a different wavelength of the spectrum.


Scientists use wavelength numbers to refer to the colors instead of color names, which is a much more accurate way to measure the color. So a red might have a wavelength of 630 or 660. Both of these look red to us, but they are actually different colors.


Plants utilize LED lights for photosynthesis through chemical reactions such as Chlorophyl A and B response. A combination of blue and red light generally has been considered sufficient for the reactions and the production of high-quality plants. This is mainly because Blue and Red LEDs are the most energy efficient and the most efficient wavebands for driving photosynthesis in plants. However, the research is still ongoing and inconclusive.


Keep in mind, however, that focusing too much on the red or blue wavelengths can create a color spectrum that is out of balance. Each plant has its own particular reaction to the light source.

Breaking Down the Light Spectrum

How do certain light spectrums affect plant growth? Here’s a quick breakdown:


●        Ultraviolet light (10nm-400nm): Plant color, tastes, aromas, metabolism, THC level elevation

●        Blue light (430nm-450nm): Vegetative growth, seedlings in young plants, production of secondary pigment, fragrance production

●        Green light (500nm-550nm): stomatal control, plant growth patterns

●        Red light (640nm-680nm): Seed germination, fruiting regulation, stem growth, leaf expansion, pigment synthesis, induce flowering of long-day plants, or to prevent flowering of short-day plants.

●        Far-red light (730nm): Ideal for plants that require little light for short periods.

GrowFilm™ Offers LED Grow Lights

If you are looking for a cost-effective, efficient solution for providing LED lighting for your indoor farm, then contact GrowFilm™. We offer a wide range of lighting solutions for indoor and vertical farm growers.


To find out more about our LED lighting products and services, call today at 952-944-9863, or you can send a message to partender@growfilm.ag.