1. History of UV-C Technology
1870
Studies on Batericidal Effects of Sunlight
1880
UV Spectrum Identified as Primary Cause of Bactericidal Sunlight
1890
First UV Lamps Developed
1903
Niels Finsen awarded Nobel Prize For Research of UV Phototherapy
1908
First UV Applications for Water Disinfection, Marseille, FR
1930
Westinghouse Develops First Commercial UV-C Lamps
1940
After WWII, Upper Room Air UV Systems Gain Popularity
1950
UV Used Widely in Hospitals For Tuberculosis Control and Elimination
2000
UV Systems Designed To Operate In Cool HVAC Environment Developed
2009
UV Systems for Healthcare Area Disinfection Introduced

2. What is Ultraviolet Light?
UV occurs naturally in sunlight
UV-A (315nm - 400nm)
Black lights and tanning
lamps, harmful to eyes
UV-B (280nm - 315nm)
Causes sunburn and skin
cancer
UV-C (200nm - 280nm)
Germicidal - Damages
DNA in cells, optimum at
265 nm
UV-C is naturally filtered by the ozone layer

3. How Does Ultraviolet Light Disinfect?
The Earth’s ozone layer filters UV-C which occurs naturally in sunlight
Germicidal UV-C systems artificially generate a wavelength of 254 nm which inactivates (disrupts DNA) of microorganisms including viruses, bacteria and mold .
Germicidal UV has been used safely in water, air and surface disinfection for many years

4. Fluorescent/Germicidal Lamp
Construction of UV-C Lamps
UV-C Lamps do not have the Fluorescent powder coating on the inside of the glass allowing the UV-C radiation outside of the lamp
Fluorescent/Germicidal Lamp

5. } Calculating Dosage 50 µw/cm2 x 60 sec. x 60 min. x 24 Hours
DOSAGE = Intensity x Time
Dosage is what determines effectiveness
Example:
50 µw/cm2
(Intensity)
x 60 sec. }
x 60 min.
(Time)
x 24 Hours
4,320,000 µw/cm2
(Dosage)
Tech Note: A Dosage of 330,000 µw/cm2 is required to “kill” Mold Aspergillus Niger
A 18 watt Biax Germicidal Lamp has a UV irradiance of 51 µw/cm2/sec

6. How It Works…
Any organic based cell exposed to UV-C Absorbs it at the molecular level...
The organism is now destroyed & ineffective.
It is unable to reproduce & unable to infect.
Deactivated DNA