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They concluded that the green filter, which makes the environment green by cutting other wavelengths out, reduced the THC concentration significantly compared to the daylight control treatment. Mahlberg and Hemphill (1983) used colored filters in their study to alter the sunlight spectrum and study green light among others. However, if one reads carefully, there are clues and data available even from the very early papers. Not many studies can be found about the effect of green light on cannabis growth or metabolism. How do LED grow lights work? Read our brief, technical guide. But blue light is crucial for good development of the cannabis plant. Similarly to UV, blue LED chips are more costly. Chlorophylls absorb blue light efficiently and the plant can use the energy coming from blue photons in photosynthesis, making blue light very beneficial for the total yield output.Ī typical, pink LED light is a combination of a high amount of red and a scarce amount of blue. HPS typically grows those tall, slim plants due to complete absence of blue wavelengths in its spectrum.ĭue to their bluish spectrum and the compactness this creates, traditional MH (metal halide) lamps have been popular for the vegetative phase. This is good because very tall, stretched plants cannot support large flower formations. In general, blue light enhances compactness and makes plants bushier. This was the first article to compare the differences between LEDs and HPS on cannabis growth and flower quality. However, blue light has been shown to increase cannabinoid concentrations, especially THC, as demonstrated in the article by Magagnini et al. Blue photons however carry less energy compared UV, therefore the responses of blue can be milder than those of UV. īlue light has many similar effects as the UVA light. For a shorter overview, read our blog post on the UV light for cannabis. To see a comprehensive breakdown of our UVA experiments, listen to our webinar, free-of-charge. The reason most stay away from it is that it requires making the luminaire from highest quality materials in order for it to be able to produce UV light consistently and long-term. To our understanding there are only two or three other LED manufacturers that use UV in their horticultural lighting. Another good outcome of high energy radiation is that some pathogens cannot withstand it.
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Growers use various other techniques such as light deprivation prior to harvest to achieve the same output. gets it to produce the precious cannabinoids which help it stay protected from abiotic stress. In simple terms, this balanced amount of high energy irradiation ‘toughens the plant up’ i.e. Read about the effects of LED lighting on human health here. Note that, even though this is actual UVA light, that it is very mild and would not have adverse effects on humans exposed to it. Valoya has tested UVA LED chips of different peak wavelengths to find the sweet spot where we get maximum cannabinoid output, without harming the plant’s natural processes.Īccording to our studies, we can optimally increase the floral and leaf cannabinoid concentrations in cannabis by using the 385 UVA wavelength. However, a little too much and we will stunt the plant’s growth and it will underperform.
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A little bit of UVA creates gentle stress that drives the plant to develop better defense mechanisms – cannabinoids.
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In some horticultural light spectra, such as the Valoya NS1 and Valoya Solra圓85, the type of UV used is UVA (radiation between 315-400 nm). Note that this paper talks about UVB (280-315nm) which is very intense radiation and typically not used in horticultural lighting. Lydon and his team concluded that UVB increased the floral THC concentration, however other cannabinoids were not affected by the UV exposure. The effect of UV on cannabinoids was first presented in an academic paper by Lydon et al. Valoya’s research efforts in this field combined with data from scientific literature should help growers better understand what UV does to cannabis. There are certainly a lot of stories, myths, and rumors about UV. How does one know which spectrum to choose? Do we know how specific wavelengths shape our plants or affect their flower quality? Well – we know quite a bit, but a lot is still unknown. Light, which is one of the most crucial factors in cannabis cultivation, comes in different colors. Different spectrum colors serve different purposes in the growth and development of the cannabis plant.