A Wood's lamp is a diagnostic tool used in dermatology by which ultraviolet light is shone (at a wavelength of approximately 365 nanometers) onto the skin of the patient; a technician then observes any subsequent fluorescence. For example, porphyrins—associated with some skin diseases—will fluoresce pink. Though the technique for producing a source of ultraviolet light was devised by Robert Williams Wood in 1903 using " Wood's glass", it was in 1925 that the technique was used in dermatology by Margarot and Deveze for the detection of fungal infection of hair. It has many uses, both in distinguishing fluorescent conditions from other conditions and in locating the precise boundaries of the condition. For most basic applications, 1 watt of UV light energy output is sufficient to create strong fluorescence effects over a 100 sq ft area. For a 200 sq ft area, simply multiply the target UV levels by 2x for an estimated 2 watts of UV light energy needed. The type of UV radiation these light bulbs emit targets the DNA of microorganisms, causing cell death or making reproduction impossible. They’re certainly not the type of light bulbs to be used in the home. They’re mainly used in professional and industrial environments in processes such as: IMPORTANT: electrical watts does not equal UV light watts! As with regular household light bulbs (e.g. 60 Watts), we are most accustomed to describing UV light bulb power in terms of its electrical energy consumption. But as is the case with household light bulbs, what matters most is the amount of light energy produced. UV light can be used to harden particular glues, resins and inks by causing a photochemical reaction inside those substances. This process of hardening is called ‘curing’. UV curing is adaptable to printing, coating, decorating, stereolithography, and in the assembly of a variety of products and materials. In comparison to other technologies, curing with UV energy may be considered a low-temperature process, a high-speed process, and is a solventless process, as cure occurs via direct polymerization rather than by evaporation. Originally introduced in the 1960s, this technology has streamlined and increased automation in many industries in the manufacturing sector. A primary advantage of curing with ultraviolet light is the speed at which a material can be processed. Speeding up the curing or drying step in a process can reduce flaws and errors by decreasing time that an ink or coating spends wet. This can increase the quality of a finished item, and potentially allow for greater consistency. Another benefit to decreasing manufacturing time is that less space needs to be devoted to storing items which can not be used until the drying step is finished.

Wear protective clothing when handling germicidal UVC lamps and keep them away from your skin and eyes. It is best to avoid prolonged exposure to the light when it is in operation. What is a "watt" of UV light? Watts are simply units of energy, and as you may recall from your introductory physics classes, energy can exist in a variety of forms - for example, electrical, kinetic, chemical, or light energy. In this case, we are measuring the amount of light energy emitted in the UV wavelengths. Radiation: Ultraviolet (UV) radiation". World Health Organization. 9 March 2016. Archived from the original on 28 January 2021 . Retrieved 15 February 2021. Fluorescent: Comes with various lamp base sizes for regular lamp holders as well as in tube form. Reasonably power efficient with a long lifespan. Cole, Curtis; Forbes, P. Donald; Davies, Ronald E. (1986). "An Action Spectrum for UV Photocacinogenesis". Photochem Photobiol. 43 (3): 275–284. doi: 10.1111/j.1751-1097.1986.tb05605.x. PMID 3703962. S2CID 29022446.

Paraskevas L. R.; Halpern A. C.; Marghoob A. A. (2005). "Utility of the Wood's light: five cases from a pigmented lesion clinic". Br. J. Dermatol. 152 (5): 1039–44. doi: 10.1111/j.1365-2133.2005.06346.x. PMID 15888167. S2CID 31548983.

Hemady, N.; Noble, C. (2007). "Photo Quiz — An infant with a hypopigmented macule". Am Fam Physician. 75 (7): 1053–4. PMID 17427621. Archived from the original on 2008-08-28.

Prevost E. (October 1983). "The rise and fall of fluorescent tinea capitis". Pediatr Dermatol. 1 (2): 127–33. doi: 10.1111/j.1525-1470.1983.tb01103.x. PMID 6680181. S2CID 42087839. Tony Burns; Stephen Breathnach; Neil Cox; Christopher Griffiths (2010). Rook's Textbook of Dermatology. John Wiley and Sons. pp.5–. ISBN 978-1-4051-6169-5. Archived from the original on 27 May 2013 . Retrieved 14 November 2010. We first note that the UV output for the product is 0.9 watts per foot. Based on our estimated UV light needs of 1 W per 100 sqft, we determine that we will need 2 W for our 200 sqft area (multiply by 2x). Fluorescent materials are also very widely used in numerous applications in molecular biology, often as "tags" which bind themselves to a substance of interest (for example, DNA), so allowing their visualization.

Morales-Trujillo M. L.; Arenas R.; Arroyo S. (July 2008). "[Interdigital erythrasma: clinical, epidemiologic, and microbiologic findings]". Actas Dermosifiliogr (in Spanish). 99 (6): 469–73. doi: 10.1016/s1578-2190(08)70291-9. PMID 18558055. S2CID 22836457. [ permanent dead link] Winter M. L.; Ellis M. D.; Snodgrass W. R. (June 1990). "Urine fluorescence using a Wood's lamp to detect the antifreeze additive sodium fluorescein: a qualitative adjunctive test in suspected ethylene glycol ingestions". Ann Emerg Med. 19 (6): 663–7. doi: 10.1016/S0196-0644(05)82472-2. PMID 2344083. A Wood's lamp may be used to rapidly assess whether an individual is suffering from ethylene glycol poisoning as a consequence of antifreeze ingestion. Manufacturers of ethylene glycol-containing antifreezes commonly add fluorescein, which causes the patient's urine to fluoresce under Wood's lamp. [21] Other [ edit ] Because UV energy has unique interactions with many different materials, UV curing allows for the creation of products with characteristics not achievable via other means. This has led to UV curing becoming fundamental in many fields of manufacturing and technology, where changes in strength, hardness, durability, chemical resistance, and many other properties are required. a b c d e f Simpson, Robert S. (2003). Lighting Control: Technology and Applications. Taylor & Francis. p.125. ISBN 978-0-240-51566-3. Archived from the original on 2013-05-27.

Black Light Uses

One of the most versatile form factors is a UV LED flexible strip. The LED strip consists of many ultraviolet LEDs (365 or 395 nm) mounted on a flexible circuitboard approximately half an inch in width. Bili light. A type of phototherapy that uses blue light with a range of 420–470 nm, used to treat neonatal jaundice. A short light bulb is okay for bodypaint and small parties. But if you need a light for something else, like a hall or outside, the range needs to be higher than normal. Brightness While BLB light bulbs are not hazardous to your health in the same way that germicidal UVC light bulbs are, they should always be handled with care. Wear gloves when handling them to avoid contaminating the light bulb, and ensure they are disposed of safely. Avoid long exposure where possible.

Mike Phillips (2007-09-25). "Eikone.com". Eikone.com. Archived from the original on 2012-03-06 . Retrieved 2011-11-08. a b c d e Booth, C. (1971). Methods in Microbiology. Vol.4. Academic Press. p.642. ISBN 978-0-08-086030-5. Archived from the original on 2013-05-27.

LED Shop Lights

BLB light bulbs are covered by a very dark blue or purple filter, and give off a purplish glow. Fluorescent tubes – either straight or turned into more compact shapes, like the example pictured – are the most common type but there are other lamp varieties available. Osram". Photocopy and UV Emitting Phosphors / Lighting Components. Sylvania. Archived from the original on 2008-01-10 – via Archive.org. These can be associated with glowing in the dark, with the use of visible UV light. They give off a purple-coloured light, they can be used in: These are each meant for very different uses and, in the case of germicidal lights particularly, could be hazardous to your health if mixed up. With that in mind, we’ve put together a handy guide to help you determine which UV light bulb is the right one for you. Cutibacterium acnes, a bacterium involved in acne causation, exhibits an orange glow under a Wood's lamp. [20]