flouresent lamps These lamps efficiently emit near UV rays at 315nm-400nm which have srong photochemical and fluorescent effects. They are special deep blue filter glass which absorbs visible rays and transmits near UV rays and two types of phosphor are used with radiation peak at 352 nm and 368 nm, respectively. They are used for tests, inspections, examination, and investigations in various fields, as well as for stage illumination in theaters and nightclubs, advertisements and sign board.