# The difference between UV-Lights

- Link: https://sifsof.com/clinical-apps/the-difference-between-uv-light/
- Published: 2020-06-13T10:09:30+00:00
- Author: Developer

The most common form of UV radiation is sunlight, which produces three main types
of UV rays:

 * UVA
 * UVB
 * UVC

The three types of UV radiation are classified according to their wavelength. They
differ in their biological activity and the extent to which they can penetrate the
skin. The shorter the wavelength, the more harmful the UV radiation. However, shorter
wavelength UV radiation is less able to penetrate the skin.

Short-wavelength UVC is the most damaging type of UV radiation. However, it is completely
filtered filtered out by ozone in the atmosphere long before it reaches our fragile
skin.

 This relatively obscure part of the spectrum consists of a shorter, more energetic
wavelength of light. It is particularly good at destroying genetic material – whether
in humans or viral particles.

UVC kills microorganisms. Since the finding in 1878, artificially produced UVC has
become a staple method of sterilization – one used in hospitals, airplanes, offices,
and factories every day. Crucially, it’s also fundamental to the process of sanitizing
drinking water; some parasites are resistant to chemical disinfectants such as chlorine,
so it provides a fail safe.

The radiation warps the structure of their genetic material and prevents the viral
particles from making more copies of themselves.

UVC light has already been in use in the fight of Covid-19. In hospitals, public
places, banks and buss, etc.. Following a guidance issued by the National Health
Commission, a **Shanghai** public transport company uses **UV light on the bus interiors
and exteriors as a way of disinfection**. According to the company, the process 
takes 5 to 7 minutes per bus and kills more than 99.9 per cent of viruses, as reported
by **AFP**.

References: [Ultraviolet (UV) Radiation](https://www.fda.gov/radiation-emitting-products/tanning/ultraviolet-uv-radiation#:~:text=UVA%20rays%20have%20the%20longest,a%20small%20amount%20of%20UVB.),
[Ultraviolet radiation and the INTERSUN Programme](https://www.who.int/uv/faq/whatisuv/en/index2.html).

 * ![Autonomous UVC Disinfection Robot: SIFBOT-6.53](https://sifsof.com/wp-content/
   uploads/2020/06/SIFROBOT-6.53-1-1-1-300x300.jpg)
 * Autonomous UVC Disinfection Robot: SIFBOT-6.53

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