For the latest news and information on the coronavirus pandemic, visit the WHO website.
TheBusinesses and homeowners alike are looking for something that can make common spaces feel safer and more hygienic. Some consumers and product manufacturers are therefore turning to ultraviolet or UV light as a possible solution – specifically one type of UV light , which has extra short wavelengths and enough energy to change the DNA and RNA of organic cells, preventing them from multiplying.
UVC light has a long history as a proven disinfectant in hospitals and laboratories, and companies such as airlines, hotels and retail outlets rely on invisible light. The pandemic has also spawned a flurry of cheap, unregulated devices for home use, including handsticks that you can use to sweep exposed UVC light over objects and surfaces.
Devices like this are nothing new, but the surge in interest in them caused by the pandemic is alarming as UVC light is a known carcinogen and even moments of direct exposure can be dangerous to the eyes and skin.
As research on UVC and the coronavirus continues, regulators, industry leaders, and safety scientists advise caution. Here’s What You Need To Know: The science, safety risks, and everything experts say should be considered before bringing a UVC powered light source into your home.
UVC’s time to shine?
Ultraviolet light is invisible electromagnetic radiation that falls between 180 and 400 nanometers in wavelength. UVC light is ultraviolet light that falls specifically between 180 and 280 nanometers — the shortest, most intense part of the ultraviolet light spectrum. Unlike less intense UVA and UVB light, which will burn your skin if you sit out in the sun too long, UVC light can burn skin within seconds. Natural UVC light from the sun is completely absorbed by the Earth’s atmosphere.
Man-made UVC light is just as intense, and just as good at ionizing organic molecules and altering their DNA and RNA. For years, scientists and medical professionals have used the invisible light as a natural disinfectant against bacteria and viruses, including the coronaviruses that cause illnesses like SARS and MERS. While scientists are still working to determine the full efficacy of UVC light against SARS-CoV-2, the coronavirus that causes COVID-19, the early indications are promising — enough so that the FDA issued guidance in March that it “does not plan to object” to any previously cleared sterilization or disinfectant devices updating their marketing to indicate that they combat COVID-19.
“Because disinfection kills most recognized pathogenic microorganisms, it can generally be inferred that sterilization and disinfection should minimize the viability of SARS-CoV-2 on surfaces and in the air in confined spaces,” the FDA wrote. That gave manufacturers a green light to begin marketing potential COVID killers.
Now, interest in UVC light is surging. Signify, formerly Philips Lighting, which has been producing UVC lighting for more than 35 years, tells Tips Clear that interest in the lights has spiked enough to justify an eight-fold increase in production since the start of the pandemic. In Kansas, Digital Aerolus developedthat can fly through contaminated spaces disinfecting everything it comes across. Here in Kentucky, Big Ass Fans recently released designed to disinfect air as it circulates throughout the room.
Those are all high-end, commercial-grade products — but interest in cheaper, simpler UVC products that people can bring into their homes is on the rise, too. That’s where safety experts are beginning to sound the alarms.
Run a quick search for “UVC” on Amazon or at Walmart and you’ll find page upon page of products that promise to sterilize your home. With names like “Germ Guardian,” “Bio Shield” and “The Germ Reaper,” most claim to kill 99.9% of viruses and other pathogens they come into contact with.
“Under the pandemic, we’ve seen a great increase in the interest around UV germicidal-type devices, including those that are now more consumer-facing,” says Todd Straka, global industry director of lighting at Underwriters Laboratories, where UVC products are tested for safety certification. “These can be very dangerous if you don’t use them properly.”
Straka and other safety science experts at UL recently teamed with the National Electrical Manufacturers Association and the American Lighting Association to address these concerns in a two-page position paper (PDF) outlining the potential risks of using uncertified UVC devices. Straka calls the situation “a major safety issue,” and his counterparts at NEMA and the ALA agree.
“We know that UVC is a proven way to help eliminate dangerous bacteria and viruses in water, air and on surfaces,” says Karen Willis, NEMA’s industry director for lighting systems. “Nevertheless, in the midst of COVID-19, we are concerned about proliferation of UVC disinfecting devices being sold with uncertain safety features and incomplete operating instructions.”
The FDA is now warning consumers about UVC lights, too, with new guidance issued just last week.
“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 guidance reads. “The risk may increase if the unit is not installed properly or used by untrained individuals.
One potential source of risk is older, mercury-based UVC lamps, as well as lamps that emit ozone, which can be toxic to the lungs — but newer, UVC LED lamps are a potential hazard, as well. The biggest concern, UL’s experts say, are uncontained devices like light wands that could potentially expose a user’s eyes or skin to the invisible UVC light at close range, causing damage. UL is unwilling to certify wands like those due to the high risk in an uncontrolled home setting.
“This is a hazard you can’t see,” explains Pamela Gwynn, principal engineer for UL’s Life and Health Sciences related to medical equipment. “They’re not toys. They’re not instantaneous. There has to be some time for the device to be in place for it to be able to do the work it’s intended to.
“The damage that’s being done is also not instantaneous,” Gwynn adds. “So it may take several days before you realize you’ve damaged your eyes or caused burns on your skin.”
Many of the products currently being sold seem to downplay that risk, or ignore it altogether. One of the sponsored products at the top of Amazon’s search ranks is a UVC light wand from a company headquartered in Shenzhen, China called 59S. The product features a child safety lock and an auto-shutoff feature if the wand isn’t shining downward, but a misleading chart at the top of the product listing comparing the wand’s LEDs to other types of UV lamps wrongly claims that the light comes with no side effects. You have to scan the fine print in one of the product photos to find a warning about exposure to the eyes and skin — it isn’t printed anywhere else in the listing, though it does say you should wear protective goggles. And, as an observant Tips Clear reader pointed out, Amazon has it categorized under “Hand Sanitizers.”
Another wand listed on Walmart features no child lock or auto-shutoff at all, and the listing never warns of any hazard to the eyes or skin — though it does boast of lights that are twice as intense as a previous model. There’s no mention of safety certification other than 3C certification via Chinese regulators, either.
The manufacturer does make sure to specify that the wand is certified waterproof.
“Can be put in the fish tank,” the listing notes.
A Walmart spokesperson provided the following statement after we first published this story:
“Walmart is committed to providing safe and compliant products to our customers. One way we do this is by requiring our suppliers to comply with all rules and regulations applicable to the products they sell, whether those items are sold in stores, online, or on our third-party marketplace. If Walmart learns that a supplier is providing non-compliant items, those items are promptly removed from sale. We are actively reviewing this matter and appreciate you bringing it to our attention.”
Amazon didn’t respond to a request for comment, though its product listings note that the company assumes no liability for inaccuracies or misstatements about products.
In an age when Clorox wipes are, sanitizing UVC light might seem like a promising alternative. But experts urge caution for anyone tempted to bring the tech into their home.
“UL has made a conscious decision not to certify the consumer-facing, portable, handheld wand-type devices due to the inability to manage the risks,” Straka tells Tips Clear.
“What we would suggest is definitely looking at products that do have a safety certification from a nationally recognized testing laboratory, such as UL,” Straka adds. “There are installers and commercial-grade products out there that do have a safety certification and which can be installed and used very safely.”
One other word of caution here: Beware of products that claim “EPA certification” as some form of reassurance about safety or efficacy. EPA certification only signifies that the company making the device has registered with the EPA, and is listed in its database of companies who make products that include an active pesticide. Being listed in that database does not certify that the company’s product is safe or effective for use in the home.
“An EPA establishment number on a pesticide device label identifies the EPA-registered location where the product was produced,” an EPA spokesperson tells Tips Clear. “Unlike chemical pesticides, EPA does not routinely review the safety or efficacy of pesticidal devices such as UV lights. Therefore EPA cannot confirm whether, or under what circumstances, such products might be effective against viruses such as SARS-CoV-2, the virus that causes COVID-19.”
What’s next for UVC
In the meantime, research continues into the potential efficacy of UVC light against the virus that causes COVID-19. Some companies that sell UVC products, like Signify and Big Ass Fans, are putting those products to the test at third-party research labs to verify effectiveness against SARS-CoV-2. Researchers at Boston University found that Signify’s wall-mounted UVC lights killed up to 99% of the virus within seconds; the company is now broadening its portfolio of UVC luminaries for commercial environments. Similar tests for thefrom Big Ass Fans are currently underway, as well.
Elsewhere, one recent study out of Columbia University looked at “far-UVC” light that shines at a less intense wavelength — still strong enough to zap viruses, but potentially incapable of penetrating eye and skin tissue.
Again, UL urges caution.
“At this point, though there are some promising studies, it’s not yet widely determined that [far-UVC light] is indeed safe, “says Gwynn.” It’s still only considered UV, and there is no exception [the far-UVC] Wavelength is not a problem. ”
“There are new studies to understand the effectiveness of UVC against COVID-19,” adds Straka, “but there is still a lot to be done in terms of research. So I’d caution consumers … if they see really robust claims on effectiveness to consider that there is still a lot of work in progress. ”