Posted on

best light spectrum for growing weed

Best light spectrum for growing weed

[3] Terashima, I. et al. Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are green. Plant and Cell Physiology. 2009.

Light-emitting diodes (LEDs) have triggered a groundswell of horticultural research over the past ten years. Unlike the high-intensity discharge (HID) lamps of old, LEDs allow us to easily isolate single wavebands of light photons — otherwise known as colors of light. That newfound control of the lighting spectrum lets us know how plants respond to light, and it debunks some long-standing myths about the best light for cannabis.

Another reason for green light’s exclusion from blue-red fixtures is a misinterpretation of laboratory studies. It’s well-documented that blue and red light are well-absorbed by plants and strongly drive photosynthesis. In fact, they’re the primary drivers of photosynthesis. The plant’s most abundant chlorophylls — chlorophyll a and chlorophyll b — absorbed and blue light.

Yet the laboratory is an isolated situation, and these studies purposefully create an experimental setting that would never occur in the real world. While informative, they don’t tell us everything we need to know about how living plants use sunlight. In the real world, the function of green light is more complex — and more important than once thought.

Our Eyes and Green Light

Research by Heliospectra prompted the market’s adoption of broad-spectrum LED fixtures containing green wavelengths. Our early studies with white light and green-emitting LEDs confirmed what academics already knew: green light drives photosynthesis and plays other important roles.

So, instead of green LEDs, lighting engineers use “white” LEDs that produce green light and other wavelengths simultaneously. It’s important to note that although some manufacturers reference green light, they’re typically referring to the white LEDs within the lamp.

The myth that plants don’t use green light stems from their green color: if the plants are reflecting green, they’re not using it. But the reality is not so simple, and only a small portion of green light is reflected to give plants their green appearance. Moreover, our human eyes sense green light more easily than other colors; not that much is reflected.

Green Light and LED Technology

In this blog, we explore how green light affects cannabis and other plants, and how you can select lighting to maximize your growth.

Many of the misconceptions about green light stem from how the human eye perceives green light. We easily perceive green light, but other colors, such as blue, are more difficult for us to see. Because so much of our environment (i.e., plant life) reflects green light, it’s adaptive for us to perceive green most readily.

Best light spectrum for growing weed

The wavelengths of each of these lights vary from one another. Violet light has the shortest wavelength of 425 to 400 nm. It is scattered successfully by the atmosphere. Indigo has a wavelength of 450 to 425 nm. It is a color between the primary colors blue and violet. Blue light has a wavelength ranging from 500 to 450 nm. In addition, green light has a wavelength ranging from 570 to 500 nm. Yellow and orange range from 590 to 570 nm and 610 to 590 nm respectively.

Ultraviolet or UV light having a wavelength that ranges between 10 to 400 nm is known for being harmful to human skin when exposed to it. Ultraviolet light in larger amounts can also harm plants. It is not visible to the naked eye and sits at the lowest end of the light spectrum. However, just because it is not visible, does not mean it is not useful to the plants. A small number of UV rays can be beneficial to the aroma, flavor, potency, and growth of marijuana plants.

How does color spectrum of grow light affect cannabis growth?

Red light is the most effective spectrum light that encourages photosynthesis. This is because it is highly absorbed by the chlorophyll pigments. Its wavelength ranges from 620 to 750 nm. This light is essential during the flowering stage of the marijuana plants. Adding red light promotes budding and flowering. Many marijuana growers switch to strong red lights with more intensity once their plant has reached the flowering or budding stage. When red light paired with blue light can balance out any overstretching or disfigured elongation of stems. Red light and blue light together produce the best response from marijuana plants.

UV light is harmful to the growth of marijuana plants-Myth or reality?

UVC rays are the most dangerous out of the three and they are not useful for both humans as well as marijuana plants.