Ultraviolet (UV) light is invisible to the human eye. They are divided into wavelengths UV-A, UV-B and UV-C.

UV-C is found within the wavelength range of 100-280 nm. From the picture in the graph, it can be seen that the light wave that is effective in inhibiting pathogens is at 265 nm.

Philips low pressure lamps have a primary wavelength of 254 nm. Laboratory research has proven to remove DNA at 85% of the maximum and 80% on the IES curve. This can be considered that the lamp of Philips can restrain the ability. in the propagation of pathogens and viruses effectively