What is the UVC dose for killing or disabling the COVID-19 virus?
Because the COVID-19 virus (SARS-CoV-2) is so new, the scientific community doesn’t yet have a specific deactivation dosage. However, we know the dosage values for comparable viruses in the same SARS virus family are 10-20 mJ/cm2 using direct UVC light at a wavelength of 254nm; this dosage will achieve 99.9% disinfection (i.e., inactivation) under controlled lab conditions. In real-life, the virus is often hidden or shaded from direct UVC light, reducing UVC’s effectiveness. To compensate, researchers are applying dosages of 1,000 - 3,000 mJ/cm2 to ensure 99.9% deactivation, the current CDC disinfection goal (see CDC’s recently published guidelines, online).According to the International Ultraviolet Association, it is generally accepted that a dose of 40 mJ·cm−2 of 254 nm light will kill at least 99.99% of “any pathogenic microorganism” , .
By far the most common wavelength for germicidal light is 254 nm, produced by low-pressure mercury lamps. These lamps are easy and cheap to manufacture because they use essentially the same technology as a fluorescent light bulb. A fluorescent bulb actually produces UV light inside the bulb. But the phosphor deposited on the glass surface of the bulb absorbs that light and re-emits it at longer wavelengths that humans can see. To make a UV lamp, the glass is replaced with a material transparent to UV light, such as fused quartz
But now COVID-19 has arrived and changed everything. “With the new coronavirus, the demand outside hospitals has soared,” said Stibich. “We’ve deployed at hotels, offices, bars, restaurants, anywhere there is a high perceived risk, or they want extra assurance. As countries re-open, these other areas are going to be important, too. We want to make sure they are as safe as possible.”
Why use a retractable Lightcast Spring Reel Kit with Timers:
IUVA recognizes that in the cases where the UVC light cannot reach a particular pathogen, that pathogen will not be disinfected. However in general, reducing the total number of pathogens reduces the risk of transmission. The total pathogenic load can be reduced substantially by applying UV to the many surfaces that are readily exposed, as a secondary barrier to cleaning, especially in hurried conditions. This would be a relatively straight-forward matter of illuminating the relevant surfaces with UVC light, for example the air and surfaces around/in rooms and personal protective equipment.
With a Lightcast UV Locking Spring Reel you can hook the light in numerous places and with a timer and remote just click on 60 minutes and leave. Kits come with all you need including UV glasses, timer system 15-30-60 minutes on/off remote, 20' retractable reel, zip ties for extension cord to the reel (14 awg 50ft an can be cut to specific size), hooks, snap clis on eye bolts, reel mount, hook pole to retrieve the light from 9+foot and option for higher, protective bulb cage and UV bulb.