Ultraviolet light is a general term for radiation in the electromagnetic spectrum with wavelengths from 10nm to 400nm, which is not visible. Used in hospitals is generally sterilization lamp (low-pressure mercury lamp), the main wave peak of the lamp is 253.7nm, the power from 4W-100W varies. It is mainly used to disinfect and sterilize and purify the air. Ultraviolet light is invisible, but ultraviolet lamps (UVD) tend to emit violet visible light, this part of the spectral wavelength may reach 450nm, into the visible light range, including violet and blue light, without the use of color filters, so the naked eye to see the light, for the lamp issued by the edge of the blue light, it looks blue-violet, due to the vision and the product manufacturing differences, some people see a lavender or light blue
Ultraviolet light is the blue light from the edge of the lamp.
Ultraviolet disinfection lamps emit light in the role of invisible ultraviolet 254nm, technically can do the whole ultraviolet light, why not do it, because the ultraviolet light on the biology of the radiation hazard, long-term exposure to skin cancer or induce some cancers, and at the same time on the eye there is a risk of burns. Make the UV light is visible to the naked eye special light, can remind people to pay attention to, no special need, do not stay long, or to do a good job of equipment confinement and wear protective gear.