Abstract: A method of manufacturing a low-pressure mercury vapor discharge lamp having a discharge envelope sealed in a vacuum-tight manner and comprising four substantially parallel co-extending glass tube parts (1,2,3,4), adjacent tube parts (1,2) being connected through a cross-coupling (5) to each other so that during operation of the lamp the major part of each of the tube parts (1,2,3,4) as well as the cross-couplings (5,6,7) are traversed by the discharge.According to the invention, first a cross-coupling (24) is established between a first tube part (20) having a length l.sub.1, which is sealed at one end (20a) and comprises at the other end an electrode (22), and a tube part (18) likewise sealed at one end (18a) having a length l.sub.1 +l.sub.2, which tube part (18) comprises at its other end an electrode (16), the tube part (18) being subdivided at (18b) into two tube parts, one of which has a length l.sub.1 (26) and the other has a length l.sub.2 (27), the tube part having a length l.sub.

Abstract: A low-pressure gas discharge lamp having a curved lamp vessel and a lamp base construction being disposed intermediate the opposed spaced ends of the lamp vessel. Contact pins which are preferably tubular are disposed in the lamp base and are provided with electrically conducting extension pieces which are fastened cross-wise in a place outside the lamp base near the center line of the lamp vessel to the corresponding feedthrough wires of the electrodes.