Blue light also known as high energy visible light, or HEV is the strong light that emits from the screens on cell phones, computers, tablets, and TVs, as well as from fluorescent and LED lighting. Rather, it indicates how long it will take for UVB rays to redden skin when using a sunscreen, compared to how long skin would take to redden without the product. However, you can enhance your sun safety simply by learning to evaluate everyday fabrics' sun protection qualities and choosing those with the best protection. In bright enough sunlight over a long enough period of time it is even possible to burn. In high short-term doses, UVB rays also can cause photokeratitis, a painful inflammation of the cornea. A number of artificial sources have been devised for producing UV radiation.
Ultraviolet radiation is used for a variety of purposes in facilities performing experimentation in laboratory rats. UV lights have been installed in some parts of the world in public restroom and on public transport for the purpose of deterring substance abuse. Recently, a reader sent me this question as a comment to one of my blog posts. I do at least 7 to 10 full skin exams every day and tons more partial exams. UV radiation is used extensively in the electronics industry because photolithography is used in the manufacture of semiconductors , integrated circuit components,  and printed circuit boards.
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Ultraviolet - New World Encyclopedia
There are no accurate or affordable ways at this time so the industry standard for re-lamping has been one year. This type of lamp is commonly used in tanning booths and for disinfecting surfaces. The ideal geometry of a fluid disinfection system for maximum utilization of the UV energy is a single lamp running along the axis of a cylindrical treatment chamber. A suntan is a reaction to exposure to harmful UVB rays. And new, improved forms of protection against UVA keep emerging. These cancers strike more than a million and more than , Americans, respectively, each year. UVC will usually degrade simple organic materials like dust particles on a surface to unhide the target microbe and destroy it.
Glass filters out a lot of UV - but not all. Ultraviolet lamps are used to sterilize workspaces and tools used in biology laboratories and medical facilities. It can also be applied to the top of a thinning scalp where skin is exposed to UV rays because the hair is not helping shade skin! Some UV wavelengths are colloquially called black light , as it is invisible to the human eye. Most of these products contain an "SPF rating" that describes the amount of protection given. UV light has a shorter wavelength than that of violet light. This spectrum has most of its output in the UVA region.