METHOD OF MANUFACTURING A LOW-PRESSURE MERCURY VAPOR DISCHARGE LAMP

摘要

A method of manufacturing a low-pressure mercury vapour discharge lamp starting from a discharge vessel (10) wherein a closed holder (22) is placed which is provided with a quantity of one or more substances to be introduced in the discharge vessel (10). Subsequently, a desired gas atmosphere is brought about in the discharge vessel (10) and the discharge vessel is closed. Finally, the holder (22) is opened. According to the invention, the holder (22) is made from a leadoxide containing glass, which leadoxide is partly reduced and in which the amount of reduction is a measure of the mercury content of the holder (22). Due to the reduction process holders (22) with different mercury contents have a different colour.