Full-spectrum light extends beyond the visible light spectrum for humans, which falls between 390 and 700 nanometers (nm). Plants require an even fuller spectrum of light for photosynthesis and growth. The full-spectrum light they require includes different colors of light that correspond to different light wavelengths. Cannabis grows particularly well under different spectrums of light, and their different colors, at different stages of growth. With indoor grows, what the plants benefit from the most initially will change as they mature.
Metal halide lights, although not used as much as either high-pressure sodium or LED when it comes to cannabis lighting, still has value for growing high-quality flower, although it’s more limited—and the reason is quite simple. Although a useful grow light, metal halide is of greatest use during the beginning stages of a cannabis plant’s growth. The blue light MH emits is very bright, and seedlings and young clones will grow well with it. Blue light is particularly useful during the vegetative stage of growth because the plants will grow short and stout, with healthy, large leaves to absorb the maximum amount of light. Blue light doesn’t force plants to stretch out to reach the beneficial rays. Instead, the plants develop extensive root and vegetative growth under blue light.
Because LED lights are adjustable, when growing cannabis with them, the best practice is to begin with the manufacturer’s recommendations and then adjust them to capture more of the red spectrum as flowering commences. There are some common mistakes that can occur for those who switch from HIDs to LEDs. For instance, you won’t need to water as much because the lights run cooler. HIDs emit a lot of heat and infrared light, which dries out plant soil much quicker than when using LEDs. As well as higher temperatures, humidity levels can sometimes be higher with HIDs as well.
HID Lights and Their Colors
The most common type of light used to grow cannabis indoors are metal halide (MH), high-pressure sodium (HPS), which are HID lights, and LEDs. Let’s evaluate the spectrum of light emitted by MH, HPS, and LED lights in more detail to gain a clearer understanding of the specific applications and benefits of each.
Violet grow lights colors wavelength ranges from 380 to 450 nm. It is the bottom end light of the visual light spectrum. The range of violet light is considered as it improves the taste of flowers. In addition, it is considered to improve the potency and color of the plants. However, violet light cannot be considered as a major growth factor when compared to the red and blue light spectrum.
In this article, you will learn about color spectrums that are needed for marijuana growth. Also, how grow lights colors affect marijuana growth.
First, you need to understand whether the color of light affects plant growth or not. The answer is yes, the color of light affects plant growth. However, it is distinctly notable under low light. The colors from the color spectrum that are most effective for the growth of plants are blue and red light. The colors like yellow and green are the least effective. Different colors should be used at different phases of plant growth. In the case of marijuana, blue light should be used during the vegetative stage. Red light is best when the plant starts entering the flowering stage and UV light helps in increasing THC levels in marijuana.
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.
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.
The advantages of UV light for marijuana plants
The different types of light colors
Red light whose wavelength ranges from 750 to 610 nm can be best viewed during sunrises and sunsets.
Marijuana plants receive a lot of information from the spectrum of light they are exposed to and react to different wavelengths in different ways. For a marijuana plant in the vegetative stage, blue light that ranges from 400 to 500 nm is best. The ideal range is 460 nm, in this stage, the plants are signaled to grow strong, healthy, and large leaves. In the flowering period, red light ranging from 620 to 780 nm can be used for the highest yields. Choosing growing lights colors spectrum of ideal wavelength 660 nm can impact the rate of photosynthesis and plant growth.
As just one example, during the spring and summer, more of the blue spectrum of light makes it to earth because the sun takes a more direct path through the sky.
Some growers believe that providing UV-B light to plants may increase the THC levels or some other aspect of potency of cannabis buds. Theoretically, it’s definitely possible since we know that UV-B light does change how plants grow. But what we don’t know is exactly how cannabis responds to UV-B exposure. It’s possible that it increases the levels of THC, but it’s also possible it reduces it, or doesn’t affect THC at all! With what little information we have today, it’s hard to know whether supplementing cannabis with additional UV-B is actually beneficial.
But cannabis is definitely not the same as lettuce and it doesn’t necessarily mean that adding green light will increase your cannabis yields! Nearly all grow lights provide some amount of green and it seems like adding too much green probably would hurt yields. But getting enhanced growth from green lighting is something to explore, especially for LED growers who often don’t give any green at all!