The goal is to push the limit of how much the plant can handle, up to the point before noticeable damage. This forces the plant into maximum protection mode and is done the last month of fruiting.
Instead of producing larger fruit, it focuses on protecting the fruits already on the plant by producing much more resinous material flavonoids or cannabinoids, depending on plant.
What you end up with is denser but slightly smaller fruit that is considerably more potent. When it comes to cannabis, there is no single guide on how to do this, and never will be. This is because cannabis sativa and cannabis indica are two very different strains with different tolerances, and most plants are hybrids. Sativa plants grow in areas that traditionally get more UV and tend to naturally have more THC whereas indica plants have been grown traditionally at higher latitudes and are higher in CBD than sativas.
It short, it requires a hands on approach and careful monitoring for every hybrid. This is also true of non-cannabis plants, which are just as varied, just as much hybrids. If you are growing tomatoes in a greenhouse, this same principle would apply to you: You can't compare a Beefstake with a Roma when it comes to UV tolerance, you have to dial it in manually. We use ours hours a day from Seedlings -Flowering. We keep it off of rooting clones. Those Solacure lights are specifically made for plants.
Been using them 4 years. I use 3 of them with a Gavita w DE HID in a 4 x 5 area at 40 inches, and run them 8 hours because of the height difference. Ultraviolet absorption spectroscopy of proteins. Amino Acids Commonly, the optical absorption of proteins is measured at nm. At this wavelength, the absorption of proteins is mainly due to the amino acids tryptophan, tyrosine and cysteine with their molar absorption coefficients decreasing in that order.
Of course, the molar absorption coefficient of the protein itself at nm will depend upon the relative concentrations of each of these three amino acids. Therefore, different proteins can have different absorption coefficients and even the wavelength of the maximum absorption may differ.
This fact can be used to help identify different types of proteins by relatively fast and simple optical tests. Imaging Proteins by UV Absorbance Most commonly, protein crystals are imaged by their intrinsic protein fluorescence. This is mostly the fluorescence of tryptophan. As such, protein fluorescence requires very powerful UV light sources and very sensitive cameras because the fluorescent emission from proteins is so weak.
However, powerful UV light sources can destroy the protein due to long exposure times required to obtain significant data. A much faster way to image proteins, either in cells, tissues or as crystals, is to utilize their strong absorption of UV light as a contrasting mechanism. By using a ultraviolet microscope or microspectrophotometer equipped for UV imaging, the sample containing the protein is imaged with nm light. The protein will absorb this light more strongly than the surrounding sample and will appear darker.
See the picture above for an example of UV absorption of a protein crystal in salt solution. While the process is quite complex, cellular activity changes chemical compounds when the plant is stressed to bring out the best in a fine cannabis cultivar.
Ionic charges, enzyme activation, and unique pathways transform the processes of cannabinoid and terpene manifestation. It is easy to visualize the chemical conversions as glandular trichomes change colours from clear to cloudy.
Outdoor cannabis plants naturally receive ample UV rays throughout their lifecycle. Frequently, plants grown in outdoor gardens produce highly intoxicating THC -rich flowers. However, it is generally recommended to only apply UVB light towards the end of the flowering stage and then just for short periods during the day.
This added stress from the intense light in the last few weeks of flowering time accelerates the chemical processes of THC conversion. Typically, applying UVB radiation to plants in early life stages is not advised as young, tender vegetative growth can burn quickly under ultraviolet light.
Another critical time is when the marijuana plant begins reproduction in the pre-flower stage. Any added stress at this junction can cause the plant to hermaphrodite.
However, some old-school growers have a different take on UVB supplementation. Experimenting with reptile lights in underground indoor grow set-ups, marijuana growers found that low doses of UVB light during late veg and early flowering time helped toughen up the plant. Some even ran lizard lights from the start when popping cannabis seeds, boasting the added UV light initiated germination.
Metal halide and high-pressure sodium HPS bulbs have been the industry standard in cannabis cultivation for decades. High-intensity discharge HID bulbs, made with mercury vapours, emit ultraviolet rays. However, most of the UVB radiation cannot escape bulbs encased in glass. When LED lighting manufactures began focusing on the cannabis industry, a few companies started incorporating UV rays into their schematics.
Realizing the advantages of stressing marijuana plants to achieve increased beneficial effects, some lighting companies integrate UV diodes within their panels. Currently, the drawback to LED grow lights is their hefty price tag. However, an economical option for cannabis growers to experiment with UVB light supplementation is with good old reptile lights.
Since cannabis plants produce more trichomes under stress from UVB light sources, flavonoids, essential oils, and resin production also surge. Additionally, terpenes responsible for the great smells and flavours of a favourite strain multiply prolifically. But most importantly, the best attribute is the added influx of THC-infused trichomes. Many growers have been aware of the benefits of UVB and have used supplemental lighting to boost potency.
However, be aware, there is a threshold where the damage to yield caused by high level UVB will exceed any benefits in potency, so caution and careful design protocols MUST be used when attempting to supplement UVB.
By Eric J. Harrington, Dir Comm. Sales and Research, California Lightworks When I discuss supplemental lighting with old school non-cannabis growers considering switching, I often. The study uses a leading third-party research organization, Readex Research,. July 22, California Lightworks. As long as you give it some kind of UVB, you are going to get the same results Basic plant biology says otherwise.
Triggering this protein is what makes the plant go into overdrive and produce tons of extra trichomes. The only way this is triggered is by exposure to nm. The overwhelming majority of UVB lamps do not produce this range. The Flower Power does. UV will damage the plants and give you cancer I get this one every now and then.
Plants evolved in the sun, where there is UV, so did humans. The key is using the right UV, for the right amount of time, and not overexposing the plants or yourself. It's simply not worth debating, the science is utterly clear that humans and plants both benefit from moderate amounts of UV.
UV will interfere with my lights Any good, pure UV light meaning it has zero visible phosphors will not. They produce almost zero visible light.
In fact, it's kind of hard to tell if they are on unless you look at them directly. Since virtually all their energy is nm and below, they will not interfere with your visible light, which is nm to nm, and obviously they won't interfere with any infrared you have.
I tried reptile lights, but they didn't kill powdery mildew, so UV won't kill PM Illogical leap of logic. Reptile lights are weak, on purpose. We have hundreds of users that use them solely for that purpose. The key is adding UV before you have a huge problem. Used regularly, you will find PM is a thing of the past. The extreme intensity is why they work. For treating PM, you need to run two hours continuously per day, no breaking up the time.
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