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Several questions about UVC LED disinfection and UVC wavelength

1.Does the peak absorption wavelength of DNA vary by bacteria?
Yes. Different types of peak absorption wavelengths are indeed different, but most of them are around 265nm.

2.Can a single wavelength eliminate all bacteria?
Yes, a single wavelength can be used. However, bacteria have different optimal absorption wavelengths.

3.Can UVC help prevent**** transmission by reducing contamination?
Based on existing evidence, we believe so. Here's why:
UVC light has been used extensively for more than 40 years in disinfecting drinking water, waste water, air,
pharmaceutical products, and surfaces against a whole suite of human pathogens (Fluence UV Dose
Required review IUVA). All bacteria and *** tested to date (many hundreds over the years, including
other ****) respond to UV disinfection. Some organisms are more susceptible to UVC disinfection than
others, but all tested so far do respond at the appropriate doses.

4.What is the "sterilizing range" of UV?
According to the International Ultraviolet Association, "the ultraviolet spectrum (the 'sterilization' region)
that is important for water and air disinfection is the range absorbed by DNA (RNA in some ***).
This sterilization range is about 200-300nm."

It is known that the bactericidal range extends above 280 nm, and it is now generally considered to
extend to 300 nm, however this may also change with more research. Scientists have shown that
ultraviolet light with a wavelength between 280nm and 300nm can be used for disinfection and sterilization.

5.What is the optimal wavelength for disinfection?
There is a misunderstanding that 254nm is the optimal wavelength for disinfection because the peak
wavelength of a low-pressure mercury lamp (determined solely by the physics of the lamp) is 253.7nm.
The wavelength of 265 nm is generally considered to be optimal because this wavelength is the peak
of the DNA absorption curve. However, a range of wavelengths have disinfection and sterilization effects.

6.Ultraviolet mercury lamps were once considered the best choice for disinfection
and sterilization. Why is this?
Historically, mercury lamps have been the only option for disinfection and sterilization. With the
advancement of UV LED technology, there are new options because LEDs are smaller, more
powerful, non-toxic, longer life, more energy efficient, and allow more switching times. This
makes the solution smaller, battery-powered, more portable, and capable of instant full-light output.

7.What is the difference in wavelength characteristics between UVC LEDs and mercury lamps?
Low-pressure mercury lamps emit nearly monochromatic light with a wavelength of 253.7 nm. Low-pressure mercury
lamps (fluorescent tubes) and high-pressure mercury lamps are also used for disinfection and sterilization. These
lamps have a broader spectral distribution, including wavelengths used for sterilization. UVC LEDs can be focused
on a narrow range of specific wavelengths, which allows the solution to be tailored to specific application needs.

8.How is the bactericidal effect determined?
Generally, power intensity, wavelength, and duration of irradiation are used to determine the bactericidal effect.
For example, in water, there may be multiple bacteria with different optimal absorption wavelengths.
For any given wavelength of germicidal UV, the power and time of irradiation need to be calculated to achieve
the desired level of disinfection.


9.Are UVC disinfection devices safe?
Like any disinfection system, UVC devices must be used properly to be safe.) They all produce varying
amounts of UVC light in wavelengths of 200nm-280nm. This UVC light is much "stronger" than normal sunlight,
and can cause a severe sunburn-like reaction to your skin, and similarly, could damage the retina of your eye,
if exposed. Some devices also produce ozone as part of their cycle, others produce light and heat like an arc
welder, others move during their cycles. Hence, general machine-human safety needs to be considered with
all disinfection devices, and these considerations should be addressed in the operations manual, in the user
training, and appropriate safety compliance.


10.Are there performance standards and UVC validation protocols for UV disinfection devices?
Given the wide array of UVC devices marketed for disinfection of air, water and solid surfaces, the lack of
uniform performance standards and the highly variable degree of research, development and validation testing
that is performed on different devices, the IUVA urges consumers to exercise caution when selecting equipment
and look for evidence of third party testing as well as certification of device materials and electrical components
by well-known organizations such as UL, CSA, DVGW-OVGW or other international requirements as applicable.

For UVC devices designed to inactivate air and solid surfaces in the healthcare industry, members of IUVA are
working diligently with other national standards organizations in the lighting and healthcare industry to develop
disinfection testing standards[x]. The goal is to develop guidance that will help healthcare providers world-wide
choose the best possible technologies for their institutions to use in the fight against multiple drug resistant
organisms and other pathogens

Shenzhen Xingliaoyuan Technology Co., Ltd It's a manufacture in Shenzhen City.

Founded in 2006, a hi-tech enterprise, professional in R&D and production of LED light source. Our products mainly its built in IC LED, high power LED, UV LED, IR LED, plant grow LED...The products. Have been widely used in LED lighting products like LED street lights, LED car lights, UV curing, , UV sterilizationn, IR smart produts and Medical field, and plant grow product. Lianxinrui its in Longgang distinct of Shenzhen. Since its inception, we always adhere to the talent-based, integrity founding of the operating principles, gathered the elite blend of the industry. With the combination of advanced foreign information technology, management methods, business experience and our own specific practical status, keeping to improve the management level and production capacity, so that we can lead the trend, grasp the future in the fierce competition in the market! Lianxinrui has always been adhering to the purpose and concept of relying on technology to open up the market, creating efficiency by good management, establishing the image with services, improving industry standards and guiding the trend of the industry. Over the years, we actively research and develop market-oriented products, and adhere to first-class quality, first-class management, first-class service to operate the company. With a win-win and mutually beneficial service concept to serve the staff, serve the clients and contribute to the society! Hope Lianxinrui products light every corner of life, add more beauty and brightness, and become your most reliable choice.