So, since UVA and UVB have similar benefits, why choose one instead of the other? Like UVB light, UVA light can also boost photosynthesis and increase yield. They showed that UVA light can also increase THC in plants. The famous grow light brand, Black Dog, did some experiments. Other studies show that UVA light has similar effects on plants.įor example, UVA light can boost the levels of nutrients and volatiles in different plant species. In some species (in small quantities), UVB light can boost photosynthetic activity. Treating the plant with UVB light resulted in around 30% increase in THC content.Īnother study revealed that UVB could make plants more resistant to pests and diseases. One study done on cannabis showed interesting results. The effect of UVB light on plants has been well demonstrated in studies. Because of that, some growers believe it’s more beneficial. With a shorter wavelength, UVB light holds more energy than UVA light. There’s a lot of debate about whether UVA or UVB is better for plants. UVA (315-400 nm) and UVB (280-315 nm) are mainly used in indoor gardening. This range divides into smaller wavelength ranges (UVA, UVB, and UVC). UV light is a range of wavelengths stretching between 100 to 400 nm. They improve the quality and yield of the plants for indoor plant growers. These molecules have protective functions, such as repairing damage or absorbing UV light. They will activate specific processes, producing certain molecules. Plants have a natural mechanism to shield themselves from the harmful effects of UV lights. So, most plants are exposed to UV radiation in their natural habitats. UV light is very energetic, so it can cause damage to living tissues.Īround 3% of sunlight is UV light. Before we show you our list of the best UV grow lights, there are a few things you should know about UV light and plants.įeel free to skip this section and scroll down to view our UV grow lights recommendations.
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