UV itself can
be subdivided into near UV (380-200 nm wavelength) and extreme or
vacuum UV (200-10 nm). When considering the effects of UV radiation
on human health and the environment, the range of UV wavelengths is
often subdivided into UV-A (380-315 nm) [also called Long Wave or
"blacklight"], UV-B (315-280 nm) [also called Medium Wave],
and UV-C (280-10 nm) [also called Short Wave or "germicidal"].
Unshielded exposure of the skin or eyes to mercury arc lamps that
do not have a conversion phosphor is quite dangerous.
The offered phosphors convert the ultraviolet radiation
of mercury discharge of UV-C range (253,7 nm) into longer wavelength
range UV-A. Such converted UV-light is applicable in medicine for
phototherapy of skin diseases (in particular, psoriasis), in cosmetics
for artificial sunburn, in photocopy equipments, for photopolymerization,
UV-hardening, metal defectoscopy, for cheking up banknotes, for creating
decorative-advertising effects in illumination and many other purposes.