| 简介 |
A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10), enclosing, in a gastight manner, a discharge space (11) provided with a filling of mercury and a rare gas. The discharge vessel (10) comprises means (41a) for maintaining a discharge in the discharge space (11). At least a part of an inner wall of the discharge vessel (10) is provided with a protective translucent layer (16). According to the invention, the discharge vessel (10) is provided with a pinched seal (20). In addition, the translucent layer (16) comprises a borate and/or a phosphate of an alkaline earth metal and/or of scandium, yttrium or a further rare earth metal. Preferably, the glass composition is made from a sodium-rich glass including the following constituents : 70-75 wt. % SiO2, 15-18 wt. % Na2O, 0.25-2 wt. % K2O. The discharge lamp according to the invention has a comparatively high maintenance. |
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