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Please note that many variables take place in a real world environment that make actual calculating very difficult (air flow, humidity, distance of microorganism to the UV light and time). However, it is proven that UV light will kill any DNA-based organism given enough dosage and that UV light breaks down DNA on a cumulative basis. Therefore, as air circulates through the ductwork of an HVAC system containing an UV light, the UV light continuously cleanses the air. If a microorganism is not effectively eradicated on the first pass through the ductwork, the UV light will continue to break its DNA down on subsequent passes. In addition, microorganisms typically do not sit in a static environment in HVAC systems except on coils which can be exposed to our lights also. In fact, microorganisms breed microorganisms if not controlled. The UV light helps to reduce incidences of inhaled pathogens for persons who reside or work in indoor environments.
The following are incident energies of germicidal ultraviolet radiation at 253.7 nanometers necessary to inhibit colony formation in microorganisms (90%) and for complete destruction:
Tests
Tests conducted by Light Sources Inc - Orange, CT and verified by American Ultraviolet Company - Lebanon, IN revealed that american-lights® produces 800 microwatts @ 1 foot with 534 feet per minute air flow @ 55º F. To compute time needed to sterilize germs in the following chart at 1 foot distance from the light, divide the dosage required by 800. Example: for 90% kill factor of Bacillus subtilis spores:11,600 divided by 800 = 14.5 seconds.
| Organisms: | Energy dosage of Ultraviolet radiation
in µW sec/cm2 needed for kill factor |
Bacillus anthracis - Anthrax
Bacillus anthracis spores - Anthrax spores
Bacillus magaterium sp. (spores)
Bacillus magaterium sp. (veg.)
Bacillus paratyphusus
Bacillus subtilis spores
Bacillus subtilis
Clostridium tetani
Corynebacterium diphtheriae
Ebertelia typhosa
Escherichia coli
Leptospiracanicola - infectious Jaundice
Microccocus candidus
Microccocus sphaeroides
Mycobacterium tuberculosis
Neisseria catarrhalis
Phytomonas tumefaciens
Proteus vulgaris
Pseudomonas aeruginosa
Pseudomonas fluorescens
Salmonella enteritidis
Salmonela paratyphi - Enteric fever
Salmonella typhosa - Typhoid fever
Salmonella typhimurium
Sarcina lutea
Serratia marcescens
Shigella dyseteriae - Dysentery
Shigella flexneri - Dysentery
Shigella paradysenteriae
Spirillum rubrum
Staphylococcus albus
Staphylococcus aerius
Staphylococcus hemolyticus
Staphylococcus lactis
Streptococcus viridans
Vibrio comma - Cholera
Molds
Aspergillius flavus
Aspergillius glaucus
Aspergillius niger
Mucor racemosus A
Mucor racemosus B
Oospora lactis
Penicillium expansum
Penicillium roqueforti
Penicillium digitatum
Rhisopus nigricans
Protozoa
Chlorella Vulgaris
Nematode Eggs
Paramecium
Virus
Bacteriopfage - E. Coli
Infectious Hepatitis
Influenza
Poliovirus - Poliomyelitis
Tobacco mosaic
Yeast
Brewers yeast
Common yeast cake
Saccharomyces carevisiae
Saccharomyces ellipsoideus
Saccharomyces spores | 4,520
24,320
2,730
1,300
3,200
11,600
5,800
13,000
3,370
2,140
3,000
3,150
6,050
1,000
6,200
4,400
4,400
3,000
5,500
3,500
4,000
3,200
2,150
8,000
19,700
2,420
2,200
1,700
1,680
4,400
1,840
2,600
2,160
6,150
2,000
3,375
90%
60,000
44,000
132,000
17,000
17,000
5,000
13,000
13,000
44,000
111,000
90%
13,000
4,000
11,000
90%
2,600
5,800
3,400
3,150
240,000
90%
3,300
6,000
6,000
6,000
8,000 | 8,700
46,200
5,200
2,500
6,100
22,000
11,000
22,000
6,510
4,100
6,600
6,000
12,300
15,400
10,000
8,500
8,000
6,600
10,500
6,600
7,600
6,100
4,100
15,200
26,400
6,160
4,200
3,400
3,400
6,160
5,720
6,600
5,500
8,800
3,800
6,500
100%
99,000
88,000
330,000
35,200
35,200
11,000
22,000
26,400
88,000
220,000
100%
22,000
92,000
20,000
100%
6,600
8,000
6,600
6,600
440,000
100%
6,600
13,200
13,200
13,200
17,600 |
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