What is UVC?

UVC is an abbreviation for short wave ultraviolet radiation. The "C" in UVC references the "C" band in light, which is 200 to 280 nanometers in length (as a comparison, visible light is above 400 nanometers in length).

UV-C (UVC) is also referred to as UVGI (ultraviolet germicidal irradiation). UVC rays penetrate the outer structure of the cell, altering the cell's DNA. This
alteration prevents the cell from reproducing, and
eventually kills the cell.

History of UVC

LATE 1800's		UV light in the form of germicidal lamps is used to kill the types of microorganisms that typically cause poor indoor air quality (IAQ). E.g., problem-causing bacteria, mold, yeast, and viruses. Niels Ryberg Finsen (1860-1904) uses UVC rays in treating disease.
1903		Niels Ryberg Finsen is awarded the Nobel Prize for Medicine. Finsen invents the UVC laden Finsen Curative Lamp (used successfully through 1950’s).
1908		UVC is used to disinfect the municipal water supply in Marseille, France.
1930's		UVC is used to disinfect the municipal water supply in Marseille, France.
1940's		UVC use expands to anywhere microbiological contamination is a concern. Typically a beam of UVC is directed across the ceiling of a room to sterilize air in: Hospitals Kitchens Meat Storage Meat Processing Plants Bakeries Breweries Dairies Beverage Production Facilities Pharmaceutical Plants Animal Labs
1950's		UVC is incorporated into air handling equipment. UVC becomes a major component in the control and eradication of TB.
1960's		Increased availability and marketing of new drugs and sterilizing cleaners helps decrease public fear of microbes, thus rendering use of UVC a less popular health concern. As air conditioning increases in popularity, the output and stability of standard UVC lamp performance decreases. The movement of cold air has a negative effect on UVC light tubes, requiring more lamps and more frequent replacement.
1970's		Energy crisis prompts conservation. People begin to shut down air-conditioners to save energy. Condensation, which previously evaporated by the constant movement of air, now builds up on air conditioning coils and drain pan, which multiplies mold and other harmful microorganisms. When the system is turned back on, the circulation begins of these harmful contaminants.