Is UV light safe?

IS UVC LIGHT SAFE FOR PEOPLE?

There is no simple answer. Here’s why: Currently there are two specific wavelengths of light(measured in nanometers or nm) generally accepted as optimal for germicidal decontamination, 254 nm and 222 nm.

UV light in the 254 nm wavelength offers peaks performance for irradiation, which means that in a matter of seconds it can penetrate a pathogen’s outer shell and destroy its ability to reproduce and therefore its ability to survive. It leaves no chemical residue and emits no ozone. The downside is that direct exposure to 254 nm light can cause skin irritation, and prolonged exposure can result in burns and potential damage to the human eye.

UV-C light in the 222 nm wavelength is slightly less potent in its ability to kill pathogens instantly but has one major advantage. All major published studies at the time of this writing indicate that it cannot penetrate the outermost layer of our skin or any part of the eye. It is currently being researched extensively to validate its safety, and if confirmed to be non-harmful, 222 nm light will play a major role in public irradiation moving forward. The downsides are longer exposure times and high cost of entry, although UV Guardian believes both barriers will be overcome quickly as the benefits of 222 nm UV-C become better known and understood.