Ultraviolet light- UV types
Let's understand some characteristics of ultraviolet light and its applications in the field of medicine.
Light visible to the human eye has a wavelength between 370nm and 750nm.
There are 3 types of ultraviolet light: UVA, UVB and UVC
-UVA type has a range stretching between 320nm and 400nm.
-UVB type ranges from 280nm to 320nm.
-UVC type is below 280nm. This is the ''germicidal'' type that destroys,with intense energy, microorganisms, viruses, bacteria.
The first two types of UV are used in phototherapy: UVA and UVB. UVA light therapy is used in combination with Psoralene, resulting in the designation P-UVA.
UVB light therapy does not require medication in parallel, being very effective itself. In this chapter it is distinguished a particular effective area for the skin: between 300nm and 315nm with a peak at 311nm.
It is this type of UV light that affects the least as side effects the skin, but which is very efficient in the treatment of psoriasis, vitiligo, acne and eczema, and which was used in the industry producing medical UV neon lamps, by Philips.
After years of research, it has been produced a type of neon lamp emitting UV light with a very narrow range, with peak at 311nm, also named neon of narrowband: NB-UVB or Narrow-band UVB.
Psoriasis, vitiligo, eczema are sensitive to this type of UVB light.
Broadband UV-b( 275- 375 nm) : And narrow band UV-b (311nm) :