Eletorot UV Torch LED Black Light Flashlight Ultraviolet Torch 395nm Lights, 3-Modes Light, Find Pet Urine Stains on Clothes Floor Carpet Rugs and Authenticate Currency

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To help prevent counterfeiting of currency, or forgery of important documents such as driver's licenses and passports, the paper may include a UV watermark or fluorescent multicolor fibers that are visible under ultraviolet light. Postage stamps are tagged with a phosphor that glows under UV rays to permit automatic detection of the stamp and facing of the letter.

Bennington-Castro, Joseph (22 November 2013). "Want ultraviolet vision? You're going to need smaller eyes". Archived from the original on 7 May 2016. Scott, KJ; Wills, RBH (1973). "Atmospheric pollutants destroyed in an ultra violet scrubber". Laboratory Practice. 22 (2): 103–6. PMID 4688707. UVB phototherapy does not require additional medications or topical preparations for the therapeutic benefit; only the exposure is needed. However, phototherapy can be effective when used in conjunction with certain topical treatments such as anthralin, coal tar, and vitamin A and D derivatives, or systemic treatments such as methotrexate and Soriatane. [115] Herpetology [ edit ] Burnett, M. E.; Wang, S. Q. (2011). "Current sunscreen controversies: a critical review". Photodermatology, Photoimmunology & Photomedicine. 27 (2): 58–67. doi: 10.1111/j.1600-0781.2011.00557.x. PMID 21392107. S2CID 29173997.Springer, E.; Almog, J.; Frank, A.; Ziv, Z.; Bergman, P.; Gui Quang, W. (1994). "Detection of dry bodily fluids by inherent short wavelength UV luminescence: Preliminary results". Forensic Sci. Int. 66 (2): 89–94. doi: 10.1016/0379-0738(94)90332-8. PMID 8063277.

Weller, Richard (10 June 2015). "Shunning the sun may be killing you in more ways than you think". New Scientist. Archived from the original on 9 June 2017. James Bolton, Christine Colton, The Ultraviolet Disinfection Handbook, American Water Works Association, 2008 ISBN 978 1 58321 584 5, pp. 3–4 a b "Ultraviolet germicidal irradiation" (PDF). University of Liverpool. p.3. Archived from the original (PDF) on 6 August 2016. Description of the Tithonometer", J.W. Draper, The Practical Mechanic and Engineer's Magazine, January 1844, pp.122–127 That way, the flashlight won’t disappear right when you need it. It uses the same 395 nm frequency range as the other devices and includes 51 LEDs. As we’ve mentioned, the 395nm wavelength is very typical for budget UV torches and should be enough for most non-commercial applications.

Ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the highest frequencies of visible light. Ultraviolet has a higher frequency (thus a shorter wavelength) than violet light. Ultraviolet absorbers are molecules used in organic materials ( polymers, paints, etc.) to absorb UV radiation to reduce the UV degradation (photo-oxidation) of a material. The absorbers can themselves degrade over time, so monitoring of absorber levels in weathered materials is necessary. The three basic skin cancers, basal- and squamous-cell carcinoma and melanoma, have been linked to long-term exposure to ultraviolet radiation and probably result from changes generated in the DNA of skin cells by ultraviolet rays. Perennial news features for many television news organizations involve an investigative reporter using a similar device to reveal unsanitary conditions in hotels, public toilets, hand rails, and such. [94] [95] Chemistry [ edit ] Electronic components that require clear transparency for light to exit or enter (photovoltaic panels and sensors) can be potted using acrylic resins that are cured using UV energy. The advantages are low VOC emissions and rapid curing.

Fingas, Mervin, ed. (2011). Oil Spill Science and Technology. Elsevier. pp.123–124. ISBN 978-1-85617-943-0.Technology for VUV instrumentation was largely driven by solar astronomy for many decades. While optics can be used to remove unwanted visible light that contaminates the VUV, in general; detectors can be limited by their response to non-VUV radiation, and the development of solar-blind devices has been an important area of research. Wide-gap solid-state devices or vacuum devices with high-cutoff photocathodes can be attractive compared to silicon diodes.

UV sources for UV curing applications include UV lamps, UV LEDs, and excimer flash lamps. Fast processes such as flexo or offset printing require high-intensity light focused via reflectors onto a moving substrate and medium so high-pressure Hg (mercury) or Fe (iron, doped)-based bulbs are used, energized with electric arcs or microwaves. Lower-power fluorescent lamps and LEDs can be used for static applications. Small high-pressure lamps can have light focused and transmitted to the work area via liquid-filled or fiber-optic light guides. UV light (specifically, UV‑B) causes the body to produce vitamin D, [46] which is essential for life. Humans need some UV radiation to maintain adequate vitaminD levels. According to the World Health Organization: [47] Reptiles need UVB for biosynthesis of vitamin D, and other metabolic processes. [116] Specifically cholecalciferol (vitamin D3), which is needed for basic cellular / neural functioning as well as the utilization of calcium for bone and egg production. [ citation needed] The UVA wavelength is also visible to many reptiles and might play a significant role in their ability survive in the wild as well as in visual communication between individuals. [ citation needed] Therefore, in a typical reptile enclosure, a fluorescent UV a/b source (at the proper strength / spectrum for the species), must be available for many [ which?] captive species to survive. Simple supplementation with cholecalciferol (Vitamin D3) will not be enough as there's a complete biosynthetic pathway [ which?] that is "leapfrogged" (risks of possible overdoses), the intermediate molecules and metabolites [ which?] also play important functions in the animals health. [ citation needed] Natural sunlight in the right levels is always going to be superior to artificial sources, but this might not be possible for keepers in different parts of the world. [ citation needed] The impact of ultraviolet radiation on human health has implications for the risks and benefits of sun exposure and is also implicated in issues such as fluorescent lamps and health. Getting too much sun exposure can be harmful, but in moderation, sun exposure is beneficial. [45] Beneficial effects [ edit ]

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Scott, K.J.; Wills, R.R.H.; Patterson, B.D. (1971). "Removal by ultra-violet lamp of ethylene and other hydrocarbons produced by bananas". Journal of the Science of Food and Agriculture. 22 (9): 496–7. Bibcode: 1971JSFA...22..496S. doi: 10.1002/jsfa.2740220916. What is ultraviolet (UV) radiation?". cancer.org. Archived from the original on 3 April 2017 . Retrieved 11 June 2017. Consider how you want to use the UV light and select one that is designed specifically for that use. Pet owners may want to get one that illuminates animal urine, saliva or other invisible stains so that they can clean them properly. Those who are interested in disinfecting a small space can also use a powerful UV light to do the job, which is specifically designed to sterilize an environment with ultraviolet light. Classification of UV". SETi. Archived from the original on 1 December 2019 . Retrieved 1 December 2019.