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Many folks have asked, what can you use a black light for? It is confusing, when you couple the wavelengths with this diatribe. This is not exact, for instance if something is listed at 380 nm, it might work for many things at the 395 nm range, (and vise-versa) just not as well.

The following list might be of help:

Applications:

365 nm
Forged document detection
Salmonella and Shigella bacteria detection
Drivers licence UV markings
Dye penetrate inspection (NDI/NDT)
Magnetic surface analysis
Counterfeit currency detection
UV Curing (requiring 365nm)
Hotel room inspection
Cat Urine
Bathroom inspection

 

380 nm
Antique glass (uranium glass, vaseline glass)
Forged document detection
A/C coolant leak detection (using dye)
Carpet inspection
Bathroom inspection
Animal urine
Arson Investigation Flashlights Lanterns
Semen
Hotel room inspection
Mineral Hunting (diamonds, etc.)
Salmonella and Shigella bacteria detection
Contaminate inspection (clean environment)

395 nm
Curing (requiring 395-400nm)
Scorpion Hunting
Antique glass (uranium glass, vaseline glass)
A/C coolant leak detection (using dye that fluoresces at 395)
Carpet inspection
Animal urine
Arson Investigation Flashlights Lanterns

465 nm
Bioluminescence
Curing (requiring 465nm)
Fingerprints (dusted with Redwop etc.)
Blood (by absorption)
Human urine
Semen