Flash discharge lamp having an arc tube in which there is a pair of
opposed electrodes, a rod-shaped trigger electrode which runs along the
outside surface of the arc tube in its lengthwise direction; and a sealed
tubular body which jackets the trigger electrode and has a hermetically
sealed arrangement containing a metal foil. The trigger electrode has a
recessed part on its surface in the vicinity of the metal foil and the
recessed part is at least partially filled with the material of which the
sealed tubular body is formed.