Below is a table that shows a range of microbes and their relevant kill factors. The table shows the incident energies of germicidal ultraviolet radiation at 253.7 nanometers (UVC) necessary to inhibit colony formation in organisms (90%) and for 3-Log (99.9%) reduction.
It is important to keep in mind that when operating any UVC equipment that more exposure/energy is better. In the case of the GreenZapr/miniZapr equipment, a more significant level of exposure is achieved in fractions of seconds. One should not get focused too precisely on any specific number. A more careful, deliberate approach to UVC equipment operation will result in greater certainty that any risk of infection by microbes has been reduced significantly.
For an analysis of the GreenZapr/miniZapr energy output, click here.
Energy needed for kill factor
|Bacillus magaterium sp. (spores)||2,730||5,200|
|Bacillus magaterium sp. (veg.)||1,300||2,500|
|Bacillus subtilis spores||11,600||22,000|
|Leptospira Canicoal-infeetions Jaundice||3,150||6,000|
|Salmonella paratyphi-enteic fever||3,200||6,100|
|Salmonella typhosa-typhoid fever||2,150||4,100|
|Staphylococcus aureus (MRSA)||2,600||6,600|
|Chiarella vulgaris (Algae)||13,000||22,000|
|Bacteriophage (E. coli)||2,600||6,600|
|Infectious Hepatitis 5,800 8,000||5,800||8,000|
|Common yeast cake||6,000||13,200|
|MOLD SPORES (Color)||90%||99%|
|Aspergillus flavis (Yellowish green)||60,00||99,000|
|Aspergillus glaucus (Bluish green)||44,000||88,000|
|Aspergillus niger (Black)||132,000||330,000|
|Mucor racemosus A (White gray)||17,000||352,000|
|Mucor racemosus B (White gray)||17,000||352,000|
|Oospora lactis (White)||5,000||11,000|
|Penicillium expansum (Olive)||3,000||22,000|
|Penicillium roqueforti (Green)||13,000||26,400|
|Penicillium digitatum (Olive)||44,000||88,000|
|Rhisopus nigricans (Black)||111,000||220,000|
Ultraviolet light is electromagnetic radiation with wavelengths shorter than visible light. UV can be separated into various ranges, with short range UV (UVC) considered “germicidal UV.” Short-wave ultraviolet radiation, in the “C” band (200 to 280 nanometers) has been used for over 100 years.
Niels Ryberg Finsen (1860-1904) is first to employ UV rays in treating disease and receives the 1903 Nobel Prize.
UV light in the form of germicidal lamps kill the types of microorganisms that typically cause indoor air quality problems -- bacteria, mold, yeast, and viruses. At certain wavelengths UV is mutagenic to bacteria, viruses and other micro-organisms.
At a wavelength of 2,537 Angstroms (254 nm) UV will break the molecular bonds within micro-organismal DNA, producing thymine dimers in their DNA thereby destroying them, rendering them harmless or prohibiting growth and reproduction. It is a process similar to the UV effect of longer wavelengths (UVB) on humans, such as sunburn or sun glare. Micro-organisms have less protection from UV and can't survive prolonged exposure to it.