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On the positive side, UV exposure enables the synthesis of vitamin D 3, which is essential for bone health [1] and potentially plays a role in inhibiting certain cancers. [ 2 ] [ 3 ] While vitamin D can also be obtained through dietary supplements, [ 4 ] UV exposure offers benefits such as enhanced subdermal nitric oxide production and improved ...
In 2009, Natural Resources Canada released a report [14] describing the possible UV exposure from several types of lamps. The report states that at 3 cm distance, the recommended daily exposure to ultraviolet radiation for skin and eye damage (if looking directly at the lamp) was attained between 50 minutes and 5 hours depending on the type of ...
Blacklight fluorescent tubes. The violet glow of a blacklight is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope. A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light.
[33] [34] [35] A study found that car windows allow 3–4% of ambient UV to pass through, especially if the UV was greater than 380 nm. [36] Other types of car windows can reduce transmission of UV that is greater than 335 nm. [36] Fused quartz, depending on quality, can be transparent even to vacuum UV wavelengths.
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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which in artificial narrowband form has a number of proven negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related ...
On December 29, 2003, a world-record ground-level UV index of 43.3 was detected at Bolivia's Licancabur volcano, [19] [20] though other scientists dispute readings higher than 26. [21] In 2005, Australia [22] and the United States [23] launched the UV Alert. While the two countries have different baseline UV intensity requirements before ...
The human eye is a wondrous thing. It is considered the body’s most complex organ after the brain and contains over 2 million working parts. About 80% of all learning happens through vision. So ...