How does UV-C inactivate microorganisms?

UV-C light can inactivate microorganisms by damaging their DNA or RNA structure, which makes them unable to perform cellular functions and reproduce.

  Is UV-C light harmful to the user?

Depending on exposure duration and amount, UV-C can cause damage to the skin and especially the eyes of people and other animals. The damages to skin range from redness or ulceration in the short term and pre-mature aging of the skin and skin cancer in extreme cases of prolonged cumulative exposure. The damages to eyes include cornea injury and acute photokeratitis.

Using UV1 per user manual instructions will not cause damage to the skin and eyes. Always make sure the UV-C LEDs are facing away from people and animals.

  Is there an “optimal” germicidal UV-C wavelength?

The germicidal wavelength range of UV-C light is between 200nm~280nm, and 265nm has the best germicidal effect because it is the wavelength at which DNA and RNA absorb the most UV energy. 265nm is also the wavelength most difficult to design and mass produce, making it more expensive than other wavelengths emitted by common UV-C LEDs.

  What are the common types of UV-C light sources used by UV disinfection devices and how do they differ?

Most common types of UV-C light source are Cold Cathode Fluorescent Lamps (CCFLs) and Light Emitting Diodes (LEDs).

CCFLs generate UV-C light by applying electricity to the containing mercury, and the emitted UV wavelength is limited to 254nm. Once turned on, the lamps take time, usually in minutes, to reach full UV output.

LEDs, on the other hand, do not contain mercury and can be designed to emit specific wavelength such as 265nm which is most ideal for germicidal applications. Once turned on, LEDs can instantly reach full UV output for rapid disinfection applications. Their much smaller size also make them ideal for use in portable and lightweight devices.