Ultraviolet light gets its name due to the “violet” color it produces in the visible portion of the spectrum although much of the output of uv light is not visible to the human eye uv leds have seen tremendous growth over the past several years. Black lights emit ultraviolet radiation (uv light) uv is radiation with a wavelength just shorter than that of violet light, which is the shortest wavelength of light in the visible part of the electromagnetic spectrum. Ultraviolet light occurs between the visible and x‐ray spectrums the ultraviolet wavelength range is specified as 10 nm to 400 nm however, many optoelectronic companies also consider wavelengths as high as 430nm to be in the uv range understanding ultraviolet led applications and precautions applications this portion of the uva.
Part of the radiation from the sun is called ultraviolet light this electromagnetic radiation is a shorter wavelength than visible light and kills microorganisms the medical industry uses ultraviolet light to sterilize rooms, equipment and medical instruments. Medical use of ultraviolet lights in 1892, marshall ward demonstrated that the bactericidal actions were from the ultraviolet part of the spectrum ultraviolet light is also used as a safe medical treatment it stimulates the immune system and has shown good results in killing blood borne pathogens.
Shortwave light is the ultraviolet energy farthest from visible light, shorter than rays in sunlight, and primarily noted for its ability to fluoresce minerals for chemical analysis ultraviolet light is electromagnetic radiation in the part of the spectrum between x-rays and visible light, approximately 180nm to 400 nm.
Like all incandescent light bulbs, a halogen lamp produces a continuous spectrum of light, from near ultraviolet to deep into the infrared since the lamp filament can operate at a higher temperature than a non-halogen lamp, the spectrum is shifted toward blue, producing light with a higher effective color temperature and higher power efficiency.
The long wavelength region, also known as near ultraviolet, black light, wood’s light or uv-a, extends from 320- 400nma portion of the population is overly sensitive to radiation in this region of the spectrum and may experience adverse. The visible region of the spectrum comprises photon energies of 36 to 72 kcal/mole, and the near ultraviolet region, out to 200 nm, extends this energy range to 143 kcal/mole ultraviolet radiation having wavelengths less than 200 nm is difficult to handle, and is seldom used as a routine tool for structural analysis. These lamps emit ultraviolet light with two peaks in the uvc band at 2537 nm and 185 nm due to the mercury within the lamp, as well as some visible light from 85% to 90% of the uv produced by these lamps is at 2537 nm, whereas only 5–10% is at 185 nm.
The light that excites the human visual system is a very small portion of the electromagnetic spectrum a rainbow shows the optical (visible) part of the electromagnetic spectrum infrared (if it could be seen) would be located just beyond the red side of the rainbow with ultraviolet appearing just beyond the violet end.