LOW-PRESSURE MERCURY-VAPOR DISCHARGE LAMP

摘要

A low-pressure mercury-vapor discharge lamp is provided with a discharge vessel and a first and a second end portion (12a). The discharge vessel encloses a discharge space provided with a filling of mercury and an inert gas in a gastight manner. Each end portion (12a) supports an electrode (20a) arranged in the discharge space. An electrode shield (22a) encompasses the electrodes (20a), the temperature of said electrode shield being, in accordance with the invention, above 450 DEG C during nominal operation of the lamp. Preferably, the electrode shield (22a) is made from stainless steel, in particular a chromium nickel steel. Preferably, an outer surface of the electrode shield (22a) is provided with a low-emissivity coating, for example a chromium or gold film. The lamp according to the invention has a comparatively low mercury consumption. Preferably, an inner surface of the electrode shield (22a) is provided with a heat-absorbing coating, for example a carbon film. Preferably, the electrode shield (22a) is supported by a support wire (26a, 27a), at least a part (27a) of said wire being made from stainless steel. The discharge lamp exhibits a comparatively low mercury consumption.