HQV® lamps and black-glass fluorescent lamps are used to create fluorescence. Various materials have the ability to convert invisible ultra-violet radiation into visible light (fluorescence effect). HQV®, L 18/73 and L 36/73 are lamps that emit long-wave UV radiation and therefore excite fluorescence. They are therefore ideal for all applications involving fluorescence analysis. The lamps generate radiation only in the long-wave UV range between 300 nm and 400 nm. Visible radiation is almost completely absorbed. HQV® lamps are normally operated on 230 V ac with a choke; the fluorescent lamps are operated with a choke and starter. Operating HQV® lamps without an outer bulb or with a damaged outer bulb is dangerous and therefore not permitted. Applications:
Material engineering Material research with fluorescence solutions, for example for detecting hairline cracks in engine shafts
Textile industry Material analysis, for example the composition and nature of additives to woollen goods, detection of otherwise invisible stains and dry-cleaning marks
Food industry Detection of adulterated food, decayed fruit (especially oranges), meat, fish etc.
Criminal investigation Detection of forged banknotes, cheques and documents or their subsequent alteration (removal of blood stains, forged pictures, etc.)
Postal service Efficient operation of automatic letter franking, detection of forged postage stamps
Effect lighting Theatre and stage, cabaret, shows, discos, bars, etc.
Other applications Advertising and shop window decoration, agriculture (examination of seed for example), mineralogy, examination of gemstones, art history, palaeography, diagnostics, etc.