Ultraviolet (UV) is a form of electromagnetic radiation with a wavelength from 10 nm to 400 nm. The word ‘ultraviolet’ means "beyond violet" (from Latin ultra, "beyond") as UV’s frequency is just above violet - the color with the highest frequency of visible light.
The spectrum of UV is further divided into ranges based on their distinctive qualities. Ultraviolet A (UV-A) with a wavelength of 400-315 nm is mainly the range we talk about when we mean the UV from sunlight. Of the UV that reaches Earth’s surface, 95% is UV-A.
Ultraviolet B (UV-B) with a wavelength of 315-280 nm accounts for the remaining 5% that reaches the Earth’s surface. UV-B radiation is responsible of producing vitamin D from cholesterol.
Ultraviolet C (UV-C) does not reach Earth’s surface since the high-energy radiation of UV-C interacts with oxygen molecules to produce ozone.
Where can UV-C be used?
It has been discovered that UV-C radiation has a germicidal effect killing or inactivating microorganisms. It does so by destroying nucleic acids and disrupting the pathogen’s DNA leaving them unable to perform vital cellular functions.
UV-C is widely used in the water disinfection industry but more and more applications are becoming available including surface disinfection, air disinfection, medical equipment disinfection, etc.
What are the benefits of the UV-C LED?
An UV-C LED has multiple benefits over traditional mercury-based lamps that are used to produce UV-C light. As with the general lighting industry, LED-s are more effective in terms of consuming less electricity and having a longer lifespan than other types of lights.