How It Works

UV-C LIGHT DISINFECTION


UVpics_absorbtion_spectrum.jpgHow it Works

  • UV-C, particularly wavelengths around 250nm-270nm has a high absorbance
    by DNA molecules. UV-C reacts with those DNA molecules and interrupts the
    cells ability to replicate.  
  • It is generally not safe for human skin and eyes to be exposed to a direct UV-C source.
  • Indirect UV-C sources are considered safe to be used in occupied spaces.  

Targeted Pathogens

  • UV-C reacts with all DNA and RNA molecules which includes all living beings and non-living, viruses and prions.  
  • Disinfection of any pathogen is measured in log kills.
  • To achieve a certain log kill for any given pathogen a particular dosage in J/m² or mJ/cm² is required. 
  • Dosages are published in various scientific literature or manufacturer’s
    instructions for various UV-C products that are on the market.   
  • The effectiveness of UV-C in breaking down any DNA molecule depends
    on dosage. Similar to dosage in medicine, the dosage here is strength of the
    UV-C source and the exposure time. It is measured in joules/square-meter,
    J/m2 or mJ/cm2.​​​​​ ​​​​UVpics_microbial_reduction_rates_cropped.jpg

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UV-A LIGHT DISINFECTION


UVpics_365nm_500x400.jpgHow it Works

  • UV-A in 365nm wavelength causes oxidation of protein and lipids inside fungi and bacteria. 
  • Lower power fixtures are used which are safe for humans, but the exposure time must be increased several hours to achieve the required dosage to kill the pathogens.  

Targeted Pathogens

  • UV-A has been tested and proven to be effective against healthcare-associated infections (HAI).  
  • A 90 percent reduction has been shown with an 8-hour exposure.  
  • HAIs include but are not limited to MRSA, E. coli, staph and others.

 


VISIBLE LIGHT DISINFECTION


UVpics_Visible400-420nm_Bacteria_500x400.jpgHow it Works

  • Visible lighting in the 400nm-420nm range interacts with porphyrin molecules inside bacteria and creates reactive oxygen species, which effectively kills the bacteria.  
  • Lower power fixtures are used which are safe for humans, but the exposure time must be increased several hours - days to achieve the required dosage to kill the pathogens.  

Targeted Pathogens

  • Visible light has been tested and proven to be effective against healthcare-associated infections (HAI).  
  • A 90 percent reduction has been shown with a 24-hour exposure.  
  • HAIs include but are not limited to MRSA, E. coli, staph and others.

VIEW THE DISINFECTION LIGHTING GUIDE