While SafeRay light has proven to be just as effective at inactivating many microbes than traditional UV light (per mJ/cm2), the main difference between the two technologies is in their safety.
Unlike traditional UV light that is harmful, SafeRay light is safe for direct human exposure. This is thanks to its unique biophysics i.e. how the physics of the light interacts with the biology of the body.
Due to its strong absorbance in biological materials, SafeRay light cannot penetrate past the outer dead-cell layers of human skin or the outer tear film on the surface of the eye. As such, SafeRay light does not reach living human cells to have any short-term or long-term safety implications. As microbes are much smaller in dimension, the light is able to penetrate their cell nuclei and that retains the light's germicidal properties.
By contrast, traditional UV light can penetrate past the dead cells’ layer (stratum corneum) and into the living cells’ layer (stratum spinosum) to cause damage. The same is the case for the eye, where conventional UV penetrates past the cornea and into the aqueous humour.
The arrows in the illustration represent penetration in your skin and eye respectively.
