Fluorescent lamp, and method of manufacturing same

Fluorescent lamp (1) comprising a glass discharge vessel (2) in which a gas is present, which discharge vessel (2) is on two sides provided with a tubular end portion (3) having a longitudinal axis, which end portion (3) includes a glass stem (5), wherein an exhaust tube (6) extends axially outwardly from said stem (5) for supplying and/or discharging gases during the production of the lamp (1), wherein an electrode (8) extends axially inwardly through the stem (5) for generating and maintaining a discharge in the discharge vessel (2). The fluorescent lamp (1) is characterised in that it meets at least one of the following equations: 1 ξ = R 1 R 2 + 1 R 3 R 4 + 1 < 0.4 or alpha = R 1 R 2 < 0.25 wherein R1/R2=a degree for the effectivity for warming up the thin glass surface of the stem (5) where the exhaust tube (6) is connected to the stem (5) (the so-called "weak spot") R3/R4=a degree for the effectivity for transporting warmth through radiation from the stem (5) to the discharge vessel (2).