[Absolute emission spectra of commonly used UV-tubes]

In this study the problem of absolute energy spectra of commercially available UV light sources was investigated. The absolute intensity of emitted light produced by two UV lamps (Waldmann and Wolff) was determined by means of narrow band UV light interference filters in combination with a research photometer calibrated according to a tungsten band lamp. The intensity of UV-A emitted by Waldmann lamps in a PUVA 4000 irradiation box was 5.5 mW/cm2. The emission of UV-B (280-320 nm) was 0.6% of the total energy. In contrast, the UV lamps provided by Wolff emitted 2.1% UV-B. The importance of exact determination of UV-B light emitted by commercial UV light sources is emphasized.