Abstract: Electrodeless low-pressure discharge lamp having a lamp vessel sealed in a gas-tight manner and filled with a metal vapor and a rare gas. The lamp vessel comprises a glass envelope which is connected in a gas-tight manner to the edge of a conically widening collar at the end of a tubular part of a sealing member also made of glass. The tubular part accommodates a rod-shaped core of a magnetic material by means of which a discharge is generated in the lamp vessel during operation of the lamp. An exhaust tube extends parallel to the longitudinal axis of the tubular part terminating at the wall of the conical collar. The end of the exhaust tube engages round an orifice in a planar surface in a cam-shaped recess provided in the wall of the conical collar. The planar surface extends substantially at right angles to the longitudinal axis of the tubular part of the sealing member.