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Ultraviolet - Research, Results And Facts

UV facts

Ultraviolet light (UV) with wavelength shorter than 300 nanometers is extremely effective in killing microorganisms. The most effective sterilizing range of UV is within the C bandwidth (UVC - 253.7nm). This range is called germicidal UV bandwidth or UVC. UVC has extremely low penetrating ability and does not penetrate past the dead-cell layers of the skin. UV will cause eye irritations or burns after prolonged exposure.

Germicidal UV has been used in water disinfection systems for many years. As stated by the American Water Works Association, "... UV light disinfection process does not use chemicals. Microorganisms, including bacteria, viruses, and algae, are inactivated within seconds of UV light disinfection... Ultraviolet is effective in inactivating Cryptosporidium, while at the same time decreasing chlorinated disinfection by-products... U.S. cities currently using or planning to use UV light water disinfection include:
Seattle, Washington, New York City, Central Lake County, Illinois, Albany, New York, Tempe, Arizona ..."

The UV topics below offer detailed information on the nature of the ultraviolet light, science research, facts and conclusions for UV effectiveness. Most importantly, artificially produced UV light by germicidal UV lamps can be utilized to improve the indoor air quality and introduce a healthier environment to live, work or study.

The science behind the UV light

Indoor Air Quality and people's health

Indoor Air Pollution - air pollutants

Ultraviolet Lighting During Orthopedic Surgery and the Rate of Infection

How UV light kills germs

UV Dosage - Ultraviolet sterilization dosage for mold, viruses, bacteria, protozoa and yeast

UV light references

UV Lamps - Artificial UV Production

UV Water Purification Applications

UV Definitions and UV Terminology

Ultraviolet (UV) Disinfection

The UV light disinfection process does not use chemicals.
Microorganisms, including bacteria, viruses, and algae, are inactivated within seconds of UV light disinfection, but all are not equally sensitive. Generally, viruses and algae are more resistant to disinfection by UV light.
UV light is effective in inactivating Cryptosporidium, while at the same time decreasing chlorinated disinfection by-products.
UV disinfection is used in air and water purification, sewage treatment, protection of food and beverages, and many other disinfection and sterilization processes.
One major advantage of UV light disinfection is that it is capable of disinfecting water faster than chlorine, and without the need for retention tanks
American Water Works Association

UV Lamps

There are many types of lamps that artificially produce UV. There are UV lamps for tanning, blacklight stage lamps and lamps for mineral displays, lamps that produce Ozone and germicidal UV lamps. Germicidal UV lamps emit shortwave UV light in the ultraviolet section of the specter also known as UVC or germicidal UV... UV Lamps

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