Abstract: The invention relates to a single-ended discharge lamp comprising a discharge tube bordering a discharge space and sealed in a gas-tight manner at its ends and also comprising electrodes, wherein the discharge tube has at least two straight tube portions and a bent connection member between at least some of the adjacent straight tube portions. The bent connection member has an arc-shaped outer and an arc-shaped inner bordering wall, an indentation narrowing the cross-section of the discharge space is formed in the outer bordering wall and the bent connection member has bulged dome portions between its ends connecting to the straight tube portion and the narrowing indentation. The solution is characterized in that the largest cross-section (A2) inside the tube wall of at least one of the dome portions (11d) is at least 1.8 times but at maximum 2.

Abstract: The invention relates to the discharge tube of a compact fluorescent lamp which discharge tube, being sealed hermetically and provided with appropriate fill, comprises at least two tube portions connected with each other, and electrodes are placed at the ends of the first and last tube portions, and lead wires protrude through the glass wall of the discharge tube to the electrodes. The invention also relates to a method for closing at least one of the tube portions forming a part of the discharge tube of a compact fluorescent lamp. The essential feature of the discharge tube according to the invention is that at least one of these tube portions is closed by a curved surface having tangents which, starting from the axis of the tube portion and extending to the cylindrical wall thereof, make a monotonously decreasing angle with the axis of the tube portion.