Affected by the COVID-19, a variety of disinfection products had become hot sell. They can quickly and effectively kill the COVID-19 with UV light, which is sought after and become favorite of a vast number of users. The National Health Commission of the People’s Republic of China has also given full recognition and recommendation to the suppression and killing effect of the COVID-19. Before we buy a product, it is necessary to understand some of the main parameters of UV and its meaning.

Firstly, we need to understand the wavelength of the UV sterilizer. Ultraviolet light can be divided into: UVA (wavelength: 320nm to 400nm), UVB (wavelength 280 to 315nm), UVC (100-280nm). Among them, scientific research has proved that DNA, RNA and nucleoprotein absorption in bacteria will break DNA chain, resulting in the cross-linking of nucleic acids and proteins rupture. UV light kills the biological activity of DNA when the wavelength of ultraviolet light is between 100 and 275nm (UVC), and thus achieve the effect of sterilization. Most bacterial viruses can be killed in a second, and the kill rate can reach 99.9%. This is the most popular non-secondary pollution sterilization method. The lights out of this wavelength range are without bactericidal function. For example, 365nm wavelength of UVA is in line with the insect-like photosynthesis reaction curve. It can be made for insect-inducing black light, and can also be used as a note-checking UV lamp. Ultraviolet health lamp, plant growth lamp is selecting UVB.

Secondly, when using high-power UV sterilizer light, people should pay attention to human and animal safety risks. UVC wavelengths are far more powerful than other UV lights. In fact, UVC does almost not exist in natural sunlight because it is blocked by the Earth's atmosphere.

UVC can cause sunburn and skin cancer, damage to the eye membrane, leading to electro-optical eye inflammation. And ultraviolet rays that stimulating air Ozone will cause lung damage if inhaled. Do not expose humans or animals to UVC radiation. Since UVC rays are invisible, there is an extra risk of unintended exposure. Therefore, when considering UVC as a sterilization method, install and configure the product very carefully to prevent exposure to humans and animals, and if necessary, it would be better to use protective equipment.

When assessing UVC security risks, it is recommended to consider the overall "dosage". In other words, you should consider not only the instantaneous power and intensity of the UVC exposure, but also its duration. For example, exposure to a low-intensity UVC lamp for long time can be just as harmful as brief exposure to a high intensity UVC lamp.

Finally, understanding that UV disinfection products have limitations. As a simple rule of thumb, UVC rays behave very much like regular light, and will not penetrate through most materials, and even clear materials like plastic and glass will not allow UVC to pass through. There are four conditions for killing bacterial and viruses: power, range, time, and surface exposure.

Suppose you are trying to disinfect your phone with a UVC lamp. Most likely, you won't be able to expose all sides of your phone at the same time. You may need to flip your phone over few times to make sure that there is enough UV exposure on all sides for adequate disinfection. This requires a UV cell phone sanitizer achieving the mobile phone without dead-end disinfection sterilization.

Due to the infectiousness of the new coronavirus, it is extremely inconvenient for people to go out to public places, such as shopping malls, elevators, etc., where there is a large flow of people, and there is a risk of infection once people come into contact with such public things. Portable UV sterilizer has become the best-selling UV disinfection product due to its sterilization rate of 99.9% and easy to carry. All kinds of ultraviolet disinfection products have been continuously developed and improved in recently years. Traditional UVC lamps are made in fluorescent tube styles, which to some extent limit the distribution and angle of UVC rays. Recent developments have allowed UVC to maintain LED form factor, while flexible UVC LED bars significantly increase the potential for innovation and versatility.