About UV

STERLIGHTS FAR-UVC 222nm

  • Unlike traditional 254nm UVC lamps, Sterlights Far-UV lamps emit a shorter wavelength of 222nm,which cannot penetrate the animal cell but is still highly efficient in destroying pathogens, and therefore exposure of humans to 222nm wavelength is safe.
  • The germicidal effect of Far-UV can decrease the pathogen load in the air and on surfaces by more than 99.99%
  • The set-and-forget solution, reducing and eliminating labor costs and human error
  • It is the only continuous and autonomous air and surface disinfection solution for occupied spaces It is safe, environmental friendly (no chemicals) and its efficacy is not impacted by temp nor airflow It is easy to validate and certify the most comprehensive viral load reduction

Far-UVC: A Proven Efficiency For Covid 19 Disinfection

Nature, June 2020, Far-UVC light (222 nm) efficiently and safely inactivates airborne human
https://www.nature.com/articles/s41598-021-97508-9

Based on the beta-HCoV-OC43 results, continuous far-UVC exposure in occupied public locations at the current regulatory exposure limit (~3 mJ/cm2/hour) would result in ~90% viral inactivation in ~8 minutes, 95% in ~11 minutes, 99% in ~16 minutes and 99.9% inactivation in ~25 minutes. Thus while staying within current regulatory dose limits, low- dose-rate far-UVC exposure can potentially safely provide a major reduction in the ambient level of airborne coronaviruses in occupied public locations

Coronavirus survival as function of the dose of far-UVC light. Fractional survival, PFUUV / PFUcontrols, is plotted as a function of the 222-nm far-UVC dose. The results are reported as the estimate plaque forming units (PFU)/ml using the conversion PFU/ml = 0.7 TCID50 29 by applying the Poisson distribution. Values are reported as mean ± SEM from multiple experiments (n = 3 alpha HCoV-229E and n = 4 for beta HCoV-OC43); the lines represent the best-fit regressions to equation (1).

Predicting airborne coronavirus inactivation

Nature, November 2020, Predicting airborne coronavirus inactivation by far-UVC in populated rooms using a high-fidelity coupled radiation-CFD model https://www.nature.com/articles/s41598-020-76597-y

The model shows that disinfection rates are increased by a further 50-85% when using far- UVC within currently recommended exposure levels compared to the room’s ventilation alone. With these magnitudes of reduction, far-UVC lighting could be employed to mitigate SARS-CoV-2 transmission before the onset of future waves, or the start of winter when risks of infection are higher. This is particularly significant in poorly-ventilated spaces where other means of reduction are not practical, in addition social distancing can be reduced without increasing the risk.

Left to right: Solution profiles at 10, 50 and 100 s after release, with 8.0 ACH ventilation. Top row: Viral distribution without far-UVC. Middle row: Viral distribution with far-UVC, Bottom row: rate of viral inactivation.

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