The UV stands for Ultra-Violet light. Ultraviolet light represents the frequency of light between 100 nanometers (nm) and 400nm and cannot be seen with the naked eye. Within the UV spectrum lie three distinct bands of light: UV-A, UV-B, and UV-C.
• UV-A (400-315nm)
The long wave UV light (315nm to 400nm) or UV-A refers, to what we commonly call "black light".This is the longest wavelength region and lowest energy;
it represents the largest portion of natural UV.
• UV-B (315-280nm)
The UV-B (280nm to 315nm), or midrange UV, causes sunburn.
• UV-C (280-200nm)

The Germicidal UV Light (200nm to 280nm), or UV-C, is effective in microbial control.

The scientific research has proved that the most effective frequency for microbial destruction is between 280nm and 200nm within this UV-C band.Therefore, as long as the nm frequency of Germicidal lamps have been well-controlled within the range, then the microbial will be destroyed/controlled effectively.

Opportunities for infection are abundant and virtually everywhere, so it is important to realize that use of the UV-C Light Sanitizer does not guarantee that the user will avoid illness.To avoid microbial infection, one must take a wide range of precautions. Use of the UV-C Light Sanitizer is an important precaution, but not the only precaution that one should take.