With AlGaN and AlGaInN, even shorter wavelengths are achievable. Close to-UV emitters at wavelengths close to 360–395 nm are by now low-priced and often encountered, for instance, as black light lamp replacements for inspection of anti-counterfeiting UV watermarks in documents and lender notes, and for UV curing. Considerably more expensive, https://focusz.de/beleuchten-sie-ihren-raum-die-geschichte-und-kunstfertigkeit-der-leuchtreklamen/