In the field of UVC LED lighting, we can boast among our products the new flexible UVC LED strips with wavelength 275nm ±5 ideal for disinfection and sterilization of objects, environments and surfaces.
Here are the main features of the UVC LED strips of Universal Science:

  • 24 Vdc
  • PCB 8mm wide
    (10mm version available on request)
  • 12 LED/mt 3737
  • Wavelength: 275nm ±5
  • Life time >15,000 hrs 60%
  • Top 45°C max
  • IP20
  • 30 LED/mt option available
  • Up to 240mW/mt UVC

Here are some possible applications for UVC LED strips:

The effectiveness of UVC LEDs

We have already seen that as a sterilizing light source, the UVC LED has great potential to provide effective disinfection. However, there are various types of UV lamps and technologies, which are not equally effective, and different wavelength ranges. Ultraviolet energy is classified according to wavelength and is divided into types A, B and C:
UV-A: 400 - 315 nm
UV-B: 315 - 280 nm
UV-C: 280 - 100 nm

To successfully develop an ultraviolet sterilization system using LEDs, it will therefore be necessary to specifically search for UV LEDs that emit light in the UV-C portion of the spectrum. The way DNA and RNA molecules react at these wavelengths will then need to be analysed, making the pathogens sterile and unable to reproduce. It is therefore necessary to use LED products that have a UV-C wavelength actually calibrated for germicidal actions.

The fact that it is absolutely essential that the correct UV wavelength is used for germicidal applications is related to the mechanism by which the pathogen is deactivated. DNA and RNA are the foundation of life, both for humans and microscopic organisms and for pathogens such as viruses, bacteria and moulds. Without the genetic material, the pathogens are unable to reproduce, leading to the death of an infectious colony. DNA molecules consist of nucleic acids called adenine (A), cytosine (C), guanine (G) and thymine (T) (uracil replaces thymine in RNA). Authoritative studies have led to the discovery that when thymine is exposed to specific UV wavelengths, the molecule absorbs ultraviolet energy and undergoes a change in chemical binding. This change in the configuration of the chemical bond causes an alteration in the DNA sequence, which prevents the pathogen from reproducing. Thymine (and uracil) has a particularly sensitive absorption spectrum at wavelengths equal to or close to 265 nanometres.

The sterilisation principle

UVC LED sterilisation principle

The effectiveness of bactericidal action

The use of UVC LEDs can kill most bacterial viruses in 1-40 seconds, as shown in the table below:

LED UVC sterilisation table

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