UV Lights and Lamps: Ultraviolet-C Radiation, Disinfection, and Coronavirus
Cathy Tsui
Chief Business Officer @ Coairo Solutions | Sales and Branding strategy officer, Alorair Solutions Inc.
Given the current outbreak of Coronavirus Disease 2019 (COVID-19) disease caused by the novel coronavirus SARS-CoV-2, consumers may be interested in purchasing ultraviolet-C (UVC) lamps to disinfect surfaces in the home or similar spaces. The FDA is providing answers to consumers’ questions about the use of these lamps for disinfection during the COVID-19 pandemic.
Ultraviolet Radiation and SARS-CoV-2 Coronavirus
Q: Can UVC lamps inactivate the SARS-CoV-2 coronavirus?
A: UVC radiation is a known disinfectant for air, water, and nonporous surfaces. UVC radiation has effectively been used for decades to reduce the spread of bacteria, such as tuberculosis. For this reason, UVC lamps are often called "germicidal" lamps.
UVC radiation has been shown to destroy the outer protein coating of the SARS-Coronavirus, which is a different virus from the current SARS-CoV-2 virus. The destruction ultimately leads to inactivation of the virus. (see?Far-UVC light (222 nm) efficiently and safely inactivates airborne human coronavirusesExternal Link Disclaimer
). UVC radiation may also be effective in inactivating the SARS-CoV-2 virus, which is the virus that causes the Coronavirus Disease 2019 (COVID-19). For more information see "Q: Where can I read more about UV radiation and disinfection?". However, currently there is limited published data about the wavelength, dose, and duration of UVC radiation required to inactivate the SARS-CoV-2 virus.
In addition to understanding whether UVC radiation is effective at inactivating a particular virus, there are also limitations to how effective UVC radiation can be at inactivating viruses, generally.
UVC radiation is commonly used inside air ducts to disinfect the air. This is the safest way to employ UVC radiation because direct UVC exposure to human skin or eyes may cause injuries, and installation of UVC within an air duct is less likely to cause exposure to skin and eyes.
There have been reports of skin and eye burns resulting from improper installation of UVC lamps in rooms that humans can occupy.
Q: Can UVB or UVA radiation inactivate the SARS-CoV-2 coronavirus?
A: UVB and UVA radiation is expected to be less effective than UVC radiation at inactivating the SARS-CoV-2 coronavirus.
Q: Is it safe to use a UVC lamp for disinfection purposes at home?
A: Consider both the risks of UVC lamps to people and objects and the risk of incomplete inactivation of virus.
Risks:?UVC lamps used for disinfection purposes may pose potential health and safety risks depending on the UVC wavelength, dose, and duration of radiation exposure. The risk may increase if the unit is not installed properly or used by untrained individuals.
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Effectiveness:?The effectiveness of UVC lamps in inactivating the SARS-CoV-2 virus is unknown because there is limited published data about the wavelength, dose, and duration of UVC radiation required to inactivate the SARS-CoV-2 virus. It is important to recognize that, generally, UVC cannot inactivate a virus or bacterium if it is not directly exposed to UVC. In other words, the virus or bacterium will not be inactivated if it is covered by dust or soil, embedded in porous surface or on the underside of a surface.
To learn more about a specific UVC lamp, you may want to:
Q: Are all lamps that produce UVC radiation the same?
Not all UVC lamps are the same. Lamps may emit very specific UVC wavelengths (like 254 nm or 222 nm), or they may emit a broad range of UV wavelengths. Some lamps also emit visible and infrared radiation. The wavelengths emitted by the lamp may affect the lamp’s effectiveness at inactivating a virus and may impact the health and safety risks associated with the lamp. Some lamps emit multiple types of wavelengths. Testing of the lamp can determine whether, and how much, other wavelengths the lamp puts out.
There is some evidence that excimer lamps, with peak wavelength of 222-nm may cause less damage to the skin, eyes, and DNA than the 254 nm wavelength, but long-term safety data is lacking. For more information see "Q: Where can I read more about UV radiation and disinfection?".
Q: What are the different types of lamps that can produce UVC radiation?
Low-pressure mercury lamp:?Historically, the most common type of lamp used to produce UVC radiation was the low-pressure mercury lamp, which has its main (>90%) emission at 254 nm. Other wavelengths are also produced by this type of lamp. There are other lamps available that emit a broad range of UV wavelengths, but also emit visible and infrared radiation.
Excimer lamp or Far-UVC lamp:?Type of lamp, called an “excimer lamp”, with a peak emission of around 222 nm.
Pulsed xenon lamps:?These lamps, which emit a short pulse of broad spectrum (including UV, visible and infrared) light have been filtered to emit mainly UVC radiation and are sometimes employed in hospital settings to treat environmental surfaces in operating rooms or other spaces. These are normally employed when no humans are occupying the space.
Light-emitting diodes (LEDs):?Light-emitting diodes (LEDs) that produce UV radiation are also becoming more commonly available. Typically, LEDs emit a very narrow wavelength band of radiation. Currently available UV LEDs have peak wavelengths at 265 nm, 273 nm, and 280 nm,?among others. One advantage of LEDs over low-pressure mercury lamps is that they contain no mercury. However, the small surface area and higher directionality of LEDs may make them less effective for germicidal applications.
Q: Where can I read more about UV radiation and disinfection?
A: For general information about UV radiation, see?Ultraviolet (UV) Radiation.
For more technical details, see these reports and publications:
For questions about this page, contact?1-888-INFO-FDA?or the Office of Health Technology 7: Office of In Vitro Diagnostics and Radiological Health (OIR)/Division of Radiological Health (DRH) at?[email protected].