This type of filter is used with UV spectral lamps to simulate specific ultraviolet regions ... Dichronic UV filters are also available in two types: short wave pass or long wave pass. Short wave ...

UVA (Long Wave) UV systems produce UVA, the near or long wave UV band (~315 to 400 nm). UVA, which is also known as "black light", makes certain pigments fluoresce. It has little effect on pathogens ...