Editing Fluorescent lamp (section)

===Black light===
Blacklights are a subset of fluorescent lamps that are used to provide [[Ultraviolet|UVA]] light (at about 360&nbsp;nm wavelength). They are built in the same fashion as conventional fluorescent lamps but the glass tube is coated with a phosphor that converts the short-wave UV within the tube to long-wave UV rather than to visible light. They are used to provoke fluorescence (to provide dramatic effects using [[blacklight paint]] and to detect materials such as urine and certain dyes that would be invisible in visible light) as well as to attract insects to [[bug zapper]]s.{{paragraph}} So-called ''blacklite blue'' lamps are also made from more expensive deep purple glass known as [[Wood's glass]] rather than clear glass. The deep purple glass filters out most of the visible colors of light directly emitted by the mercury-vapor discharge, producing proportionally less visible light compared with UV light. This allows UV-induced fluorescence to be seen more easily (thereby allowing [[blacklight poster]]s to seem much more dramatic). The blacklight lamps used in bug zappers do not require this refinement so it is usually omitted in the interest of cost; they are called simply ''[[blacklite]]'' (and not blacklite blue).