UVA light has been shown to be effective for plant growth for several years

UVA light has been shown several years ago to increase the activity of secondary metabolites in many plants, as is the case with cannabis. From a cannabis grower's perspective, the most important secondary metabolites are cannabinoids, such as THC and CBD, and terpenes, which give cannabis its distinctive aroma. Short-wave irradiation, such as UVA and blue light, triggers a stress response system in plants that begins to protect themselves from abiotic stresses, known as short-wave irradiation. Increased stress levels lead to increased metabolite activity, resulting in higher THC accumulation in flowers, compared with light sources lacking UVA or blue light.

Spectral requirements and details of cannabis seedlings

Since plants can't move, they read signals from their surroundings in terms of temperature, spectrum, soil moisture content, and so on. Short-wave radiation, such as blue light and UVA light, allows a plant to signal that it is under clear skies without being exposed to competing plants in the neighboring environment. A non-competitive environment indicates that the plant is not in a hurry to reproduce (produce seeds) or to extend toward the light. Plants growing in the rich blue and UVA spectra usually have short internodes, lobular area, and thick leaves. These responses can be reversed by green or far-red light to induce shade avoidance syndrome symptoms, such as stem extension, increased leaf area, and increased flowering. So by adjusting the amount of blue and UVA in the spectrum to a perfect balance relative to the other wavelengths.

Growing cannabis plants requires unimpeded access to full sunlight

Perhaps it is not surprising that the most potent cannabis plants in nature often occur at high altitudes. In these regions, plants have unimpeded access to abundant sunlight, and their spectra are higher in ultraviolet wavelengths than they are at lower altitudes.

The increase of THC content in flowers is beneficial for metabolic activity

As mentioned earlier, UVA in hemp wool increases metabolite activity, such as increased THC or terpene content in flowers, but growers can benefit from increased secondary metabolite activity in other ways. Plants mildly exposed to UVA radiation continuously produce secondary metabolites, such as antioxidants and phenolic compounds, to protect themselves from abiotic stress at the cellular level. These secondary metabolites protect plants not only from light but also from pathogens and pests. The result is a compact plant with a higher THC concentration, and it is more resistant to fungal pathogens such as Botrytis (Kim et al., 2013) and pests. UV has also been shown to directly reduce the growth of fungal pathogens by inhibiting spore formation.

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Adding UVA or UVB light fixtures to your plants is potentially dangerous because the UV rays are so strong that they can damage the plants, the workers exposed to them, and even the plastic benches on which the plants are placed. A small amount of excessive UV light can inhibit the development of a plant and eventually destroy it. Therefore, it is important to obtain UV-rich spectra from companies that have a good track record in photobiology research and are willing to share their research data.

Since 2015, there has been no stop in the research and experiments on the spectral effect on the growth of hemp plants. The research and development of new technologies such as full spectral lighting is the result of all our efforts. High yield is achieved by increasing the saturation of cannabinoids and terpenes. How does a spectrum do all this? Half of the reason is that gardening is different from other LEDs in the spectrum. Our LED plant lights also include UV light. Almost all other marijuana LEDs on the market are variations of normal office space lighting, within the 400-700nm range. The cost of constructing a spectrum with shorter wavelengths requires higher costs and greater expertise to make high-quality cannabis a hit in the market.

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