LOW-PRESSURED DISCHARGE LAMP

摘要

In the case of the low-pressure discharge lamp (1) having a wound discharge vessel (2) composed of one or more glass tubes bent in a U-shape, the glass tube or tubes which is or are bent in a U-shape consists of or consist of in each case two longitudinal tube sections (8, 9) and a 180 DEG bend (10). The internal diameter of the 180 DEG bend (10) reduces from the transition of the longitudinal tube sections (8, 9) towards the apex (I, I') and there has an essentially ellipsoid internal cross-section, the ratio of the minor axis d to the major axis D satisfying the equation 0.5