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ETA - Medium-Pressure Mercury Lamps
In medium-pressure mercury lamps, a plasma that emits UV light is generated by applying electrical voltage. Unlike most other UV sources, the medium-pressure lamp (MPL) has a polychromatic spectral distribution from 190 nm up to the infrared spectrum. The distribution of energy over the wavelength ranges is depicted on the left.
The UV light radiation properties of standard mercury lamps relate directly to the radiation characteristics of atomic mercury. The spectral emission depends on the properties of the plasma, such as temperature, pressure and atomic as well as molecular content. Far infrared radiation is generally determined by the temperature of the lamp body that lies at approx. 600 °C up to a maximum of 900 °C. The typical UV efficacy for different lamp types can be found in the table below.