Abstract: The invention relates to a tubular discharge lamp (1) with a wall (4) which is transparent to UV-radiation. The tube (2) encloses a discharge space (5) having an internal diameter D. The discharge space (5) comprises a filling of mercury metal vapor in a concentration range of 0.4-2.5 mg/cm3. A reduction of both the diameter D from about 22 mm down to about 13.5 mm and the average mercury concentration from about 1.7 mg/cm3 down to about 0.8 mg/cm3 leads to an increase in the effective germicidal UV-output of the lamp (1) of about 35%.

Abstract: Induction lamp system comprising a power supply unit, which can supply a high-frequency altenating voltage, a power supply cable connected to the power supply unit and an induction lamp connected to the power supply cable. The lamp is provided with an induction coil, and at least one electronic component is arranged between the induction coil and the power supply cable. The electronic component together with the induction coil and the power supply cable have a combined impedance Z. According to the invention, and due to the properties of the electronic component, it holds that the absolute value of the imaginary component Im(Z) of the impedance Z is smaller than the real component Re(Z) for any arbitrary length of the power supply cable.

Abstract: The invention relates to a tubular discharge lamp (1) with a wall (4) which is transparent to UV-radiation. The tube (2) encloses a discharge space (5) having an internal diameter D. The discharge space (5) comprises a filling of mercury metal vapor in a concentration range of 0.4-2.5 mg/cm3. A reduction of both the diameter D from about 22 mm down to about 13.5 mm and the average mercury concentration from about 1.7 mg/cm3 down to about 0.8 mg/cm3 leads to an increase in the effective germicidal UV-output of the lamp (1) of about 35%.