Ultraviolet (UV) light is used for many
purposes that promote health and wellness as there are many applications that
harness the benefits of UV light for medical use.
UV Lamps Provide Many Health Benefits
UV
light is measured in wavelengths mainly in the spectrum of 100 nanometer (nm)
to 380 nm and is divided into three regions: UVA (320 – 400 nm), UVB (280 – 320
nm), and UVC (100 – 280 nm). UVC is short wave UV radiation and is completely
absorbed by the ozone layer when emitted by the sun. UVA and UVB are the rays
that reach the earth and are associated with the common sunburn as well as
providing benefits like vitamin D and many other phototherapy treatments.
Scientists
and lamp engineers such as the knowledgeable engineers at LightSources design
and engineer UVC germicidal lamps to emit 254 nm, the most effective wavelength
to kill viruses and bacteria. 185 nm ozone lamps are also effective in many
sterilization applications. UV lamps designed to emit UVA and UVB wavelengths
provide benefits to the medical industry in phototherapy lamps, as these
wavelength emissions are proven effective to treat a host of medical
conditions.
UV
lamps provide many benefits in two distinct areas:
COVID-19 (Coronavirus Disease 2019) is
the disease caused by the novel coronavirus, SARS-CoV-2, which is the cause of
a viral outbreak that led to a devastating global pandemic. Public health
systems and economies worldwide have been ravaged by this virus and many people
are asking the question, “Does UV light kill Covid?”. As of December 31, 2021,
the pandemic is experiencing a surge with the new Omicron variant and a
total death toll of 5,439,895 globally, with more than 825,816 deaths in the
United States. *UPDATE – as of 3/29/23, there have been 761,402,282 confirmed
cases of COVID-19, including 6,887,000 deaths globally, and 102,697,566
confirmed cases of COVID-19 with 1,117,054 deaths in the U.S., as reported by
the World Health Organization, WHO.
We put
together a compilation of several studies showing the effectiveness
of UV light for COVID, including how UVC light kills other coronaviruses, how
SARS-CoV-2 is transmitted, and UVC lamps that are proven effective at
eliminating betacoronaviruses and the SARS-CoV-2 virus that causes COVID-19.
Types of UVC Lamps Effective in Killing
Covid
Ultraviolet
(UV) light is a type of UV radiation from the sun, that has less energy than
X-rays and gamma rays, although has more energy than visible light and radio
waves. Sunlight emits natural UV rays in three broad spectrums, UVA, UVB and
UVC. People can experience exposure to UVA and UVB rays from natural sunlight,
although most UVC natural rays are absorbed by the ozone layer.
UVC
light is replicated in manmade germicidal UVC lamps, which have been proven to
kill many viruses and bacteria including beta coronaviruses. SARS-CoV-2 is in
the beta coronavirus family similar to the MERS (Middle East Respiratory
Syndrome) and SARS (Severe Acute Respiratory Syndrome). UVC light is proven
effective at eradicating MERS and SARS and recent studies show that UVC lamps
are also similarly effective in killing the SARS-CoV-2 virus that causes COVID-19.
Does UV Light Kill Covid in Liquid?
UV
light is an effective disinfectant and sterilizer, proven to kill viruses in
water, on surfaces and in the air. UVC light effectively inactivates bacteria
and viruses by damaging nucleic acids of cells, rendering them unable to
replicate. An inactivated cell that is unable to replicate is considered
harmless and unable to spread further disease. According to a recent study in the
American Journal of Infection Control (AJIC), UVC light is proven effective at
killing the SARS-CoV-2 virus that causes COVID-19 in liquid cultures as “SARS-CoV-2 is highly
susceptible to irradiation with ultraviolet light“.
UVC lamps
are used in UV water disinfection applications such as waste water
treatment plants, aqua culture, pool and spa and many additional water
sterilization needs.
UVC
germicidal lamps have been shown to be effective at killing the SARS-CoV-2 on
surfaces in studies by the AJIC showing
a 99.7% effective rateon laboratory surfaces.
In order to achieve this high efficacy rate to disinfect surfaces they must be
clean and experience direct exposure.
For this
reason, many hospitals and medical
facilities have added UVC light disinfection to their regular cleaning regimen.
UVC light disinfection helps to keep hospital rooms, surgical rooms, surgical
and medical equipment sterile and free from harmful bacteria, including some
antibiotic resistant superbugs.
UVC
disinfection is helping restaurant owners get back to business and keep their
staff and patrons safe. UVC lamps are used in many areas of a restaurant such
as disinfecting commercial kitchen surfaces and preventing grease build-up in
exhaust fans. Learn the many benefits of UV lamps for restaurants.
UVC lamps manufactured
to emit light in the UVC range are the most effective to kill viruses and
bacteria, with standard germicidal lamps designed to emit light at 254 nm.
While this wavelength is proven highly effective it can also be damaging to
human skin and eyes, therefore some germicidal lamps are designed to emit
wavelengths between 207- 222 nm, referred to as Far-UVC light. Far-UVC light is
effective at killing germs and viruses and is less hazardous to skin and eyes
than other types of UVC lamps.
Many
scientists believe that airborne particles are one of the most common modes of
transmission of the SARS-CoV-2 virus, thus sterilizing and disinfecting air in
enclosed spaces should help to protect people against contracting the COVID-19
disease. UVC lamps in HVAC units are an effective method of
sterilizing air and is utilized in many commercial, industrial, and residential
air purification systems.
A recent study published
in Scientific Reports concludes that UVC light is effective at killing airborne
human coronaviruses including those that cause the common cold and the
SARS-CoV-2 virus.
Based
on what we know about ultraviolet light, specifically UV light emitted in the
UVC range, many studies are showing that UV light may be used as a valuable
tool to kill the SARS-CoV-2 virus that causes COVID-19 in liquid, on surfaces
and in the air. Far-UVC light may be a good choice for some disinfection
applications with less harmful health risks to human exposure.
Quality UVC Lamps Proven to Kill
Viruses
LightSources
is recognized internationally as a leading supplier of high-quality germicidal UVC lamps proven to kill many viruses and
bacteria, with a modern state-of-the-art glass factory in Europe and several
valuable partner companies providing custom engineering services. You can find
our UV disinfectant lamps in many applications worldwide for water, air and
surface sterilization.
Our
engineers possess deep technical knowledge of UV radiation and lamp design,
with a commitment to continual improvement through research and development.
Our UV light proprietary technologies include LongLife+, which is a specialty
coating engineered to increase the life of your lamp for up to 16,000 hours. We
offer prototype solutions with rapid development, custom engineering to meet
your specific and unique specifications and proprietary solutions for you that
increase your brand awareness.