Ensuring effective disinfection

The effectiveness of UV disinfection depends on a number of factors such as power of UV source, type of UV spectrum, exposure time, distance of micro­organisms from the light source, type of microorganism, the presence of particulate, shadow zones, etc. Here, we explain some of the key parameters you need to consider when choosing a UV technology. For in-depth information, please download our guide.

Level of disinfection

The desired level of disinfection may vary from case to case. The goal is to reduce the concentration of microorganisms to a level which is considered to be safe for the particular environment. Different technologies have varying abilities to reduce the relative number of microorganisms.

Type of germs

Do you want to deactivate all kinds of germs or specific viruses or bacteria? As germs absorb and react to UV light differently, you need to consider the type of microorganisms you’re facing to choose the right technology.

The subject of disinfection

What do you want to disinfect? Air, water, food or surface all respond differently to different UV technologies.


The temperature or variation (+/-) of the temperature during a disinfection cycle plays a major role in the choice of technology since it can cause a substantial change in the UV light source output.

Regrowth rate

Germ regrowth poses a serious risk. Different UV technologies can inactivate germs to different degrees, some only temporarily and some permanently.

The efficacy of UV light also depends on irradiance time, the distance to the object and its geometry. If you are interested in finding out more, download our “Guide to smarter UV disinfection”.

If you have any questions or would like more information about UV technology in general or PureFize® in particular, please contact us.