Yes, the bactericidal effect of UV germicidal lamps is indeed closely related to the irradiation distance. The closer the distance, the better the bactericidal effect, because the UV intensity decreases rapidly with the increase of distance.
Cause analysis
The relationship between UV intensity and distance:
The relationship between UV intensity and distance follows the inverse square law. That is, UV intensity is inversely proportional to the square of the distance. As the distance increases, the intensity of ultraviolet light rapidly decreases.
For example, if the distance is doubled, the intensity of ultraviolet light will drop to a quarter of the original. Therefore, the closer the distance from the ultraviolet lamp, the higher the dose of ultraviolet light received per unit area, and the more significant the bactericidal effect.
Bactericidal effect and UV dose:
The bactericidal effect is directly related to the dose of UV (i.e. the received UV energy). The higher the dose, the better the bactericidal effect. Higher doses of UV are able to destroy the DNA and RNA of microorganisms more effectively, thus killing them.
If the distance is too far, the UV dose may not be enough to effectively kill microorganisms, especially some of the more tolerant bacteria and viruses.
Practical application considerations
Reasonable control distance:
When using the ultraviolet germicidal lamp, it should be as close as possible to the target object to improve the sterilization efficiency. It is usually recommended that the distance between the ultraviolet lamp and the surface to be sterilized is not more than a few centimeters to tens of centimeters, depending on the power of the lamp and the application scenario.
Uniform irradiation:
To ensure that all areas receive adequate UV exposure, the coverage of the light source needs to be considered. If the luminaire is too close to the target, the light may not cover the entire surface evenly, and it may be necessary to move the luminaire or use multiple luminaires to achieve even sterilization.
The balance of time and distance:
Although the closer the distance, the better the effect, but also need to consider the disinfection time. For longer distances, the exposure time may need to be extended to ensure that sufficient UV dose reaches the target surface.
Security:
Because ultraviolet light is harmful to the human body, it is more necessary to pay attention to operation safety when using at close range to avoid direct exposure of skin and eyes to ultraviolet light.
conclusion
The germicidal effect of ultraviolet germicidal lamp is indeed inversely proportional to the irradiation distance, the closer the distance, the better the germicidal effect. However, in practical applications, it is also necessary to consider the irradiation time, coverage and safety to achieve the best bactericidal effect. When using UV germicidal lamps, reasonable control of the distance is one of the important factors to ensure the disinfection effect.
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Shenzhen Hechuang Hitech CO., LTD. is a National High-tech Enterprise, which has won a number of invention patent technology awards. We focuses on the Research, Development, Production and Application of INNEST UVC-LED Technology. It adopts innovative technologies of revolutionary optics and fluid science, which can kill bacteria and viruses in 0.2 seconds, with a sterilization rate of 99.999%. Hechuang Hitech provides safer, more efficient and more humanized sterilization module design for Water Air and Surface Disinfection products.
