What is UVC Light, and How Does It Kill Germs?
Why UVC?
WHAT IS UV LIGHT?
Ultraviolet (UV) light is a form of light, invisible to the human eye, that exists on the electromagnetic spectrum between X-rays and visible light. We are exposed to low levels of UV light from the sun’s rays every day, although much of the UV energy is absorbed by the ozone layer.
Ultraviolet Light
You’ve probably seen the visible light spectrum before; on the spectrum, visible light (violet to red) is from 380 nanometers to 780 nm. As a reference, most household lamps are between 500 and 700 nm.You may also be familiar with UVA and UVB (280nm-400nm), related to suntans and sunburns and used in tanning bed applications.
UVC in Disinfection
UVC radiation, in the range of 250 nm - 280 nm, renders harmful micro-organisms such as bacteria and viruses ineffective, by destroying the genetic information in the DNA. The micro-organisms lose their reproductive capability and are destroyed. The germicidal nature of UV is well suited to treat parasites which are extremely resistant to chemical disinfectants, such as Cryptosporidium or Giardia.
Why LEDs for UVC?
Though UV lamps are able to generate considerably higher power output than existing UV LEDs, UV lamps suffer from several drawbacks. Specific advantages of UV LEDs over UV lamps - such as deuterium gas discharge lamps, mercury arc or vapor lamps - include:
Monochromaticity (No filters necessary)
Point source
Instanteneous on/off (No warm up period)
Small footprint
Energy efficiency
Environmental friendliness (No mercury)
Mechanical robustness (unlike UV lamps which are fragile and susceptible to breakage)
Safety (Low voltage source)
Wide range of temperature of operation
Longer lifetimes
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Gilber Lan
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