Abstract: The invention relates to a light source comprising: an at least partly light-transmitting elongate discharge vessel filled with an ionizable substance, at least one first electrode and at least one second electrode connected to respective end portions of the light source, between which first and second electrodes a discharge extends during lamp operation, at least one electrode of the first electrode and the second electrode extending laterally with respect to the corresponding end portion. The invention also relates to an assembly of light sources according to the invention.