Ultraviolet represents about 10% of the electromagnetic radiation output of the Sun but much of this is filtered by the atmosphere of the Planet Earth.Fluorescence is when a material absorbs electromagnetic radiation such as UV and emits visible light.Ultraviolet light plays a role in the production of vitamin D by humans and other organisms. Ultraviolet light is important to astronomy. For example, astronomers use solar-blind devices that ignore sunlight but are sensitive to bands of UV light.Fires, particularly hot fires, produce UV rays. For this reason, UV detection can be used to detect fires.Fluorescent lamps emit some UV.The list above is not exhaustive -- there are many sources of UV light.
Disinfection Machines & Robots
Medical Devices (e.g. UVB phototherapy)
Tanning Beds / Tanning Lamps
UV Curing Lamps
Ultraviolet Air Purification
Ultraviolet Sterilizers (e.g. use of UV in food processing to control microorganisms)
Water Purification Infrastructure