A Specific Type of UV Light
Germicidal ultraviolet light (UV-C) is part of a larger category: Ultraviolet light, which also includes UV-A and UV-B rays. As shown in the electromagnetic spectrum diagram, ultraviolet light is in between x-rays and visible light.
While all 3 of these subcategories (UV-A, UV-B, and UV-C) are produced by the sun, the earth’s ozone prevents some UV-B and all UV-C rays from getting through. Since UV-C light is harmful to eyes and skin, direct air and surface disinfection must only be used in unoccupied areas (or where occupants are wearing proper protective gear). Learn more on our UV-C safety page.
Germicidal Ultraviolet Kills Germs
As shown in this table, UV-C differs from UV-A and UV-B in the size of its wavelengths. Atlantic Ultraviolet Corporation’s STER-L-RAY® Germicidal UV lamps produce 95% of their rays at 254 nanometers, the specific wavelength that destroys the DNA structure of harmful bacteria, viruses, and mold. After the right UV dose, these microorganisms are unable to reproduce and are rendered harmless. View our list of UV-C doses for neutralizing many pathogens and learn more about how UV-C light works.
| UV Type | Wavelength Range (nanometers) |
|---|---|
| UV-A | 315–400 nm |
| UV-B | 280–315 nm |
| UV-C | 100–280 nm |
Its Benefits and Limitations
Germicidal ultraviolet disinfection is rapid, low-maintenance, and does not use chemicals or produce byproducts. To achieve proper disinfection of water, air, or surfaces, each medium must be exposed to UV-C light (at the wavelength of 254 nanometers) for an appropriate amount of time, depending on the intensity of the UV lamp used.
When used to disinfect water, UV-C should be the final step before use. It is intended to treat visually clear water that is not colored, cloudy, or turbid. Learn more about UV water purifier operation. When used for surface disinfection, multiple treatment cycles may be required for places where UV rays are obstructed. Learn how UV air and surface models work.
Uses for Germicidal Ultraviolet
Germicidal UV technology has many residential, commercial, and industrial uses. Browse our application pages and UV blog to learn more. Our team of UV application specialists can be reached at (631) 273-0500 or Sales@AtlanticUV.com with any questions you may have.