The invention describes an electrode (1) for use in a lamp (3) comprising a quartz glass envelope (30) enclosing a chamber (31), which electrode (1) comprises a tip for extending into the chamber (31) and base for embedding in a sealed portion (33) of the quartz glass envelope (30), characterized in that the base comprises a plurality of essentially smooth concave channels (2) arranged around the body of the electrode (2) and wherein the depth (dch) of a channel (2) is preferably at most 8 percent, more preferably at most 5 percent, most preferably at most 3 percent of a diameter (De) of the electrode (2). The invention further describes a method of manufacturing an electrode (1) for use in a lamp (3) comprising a chamber (11) in a quartz glass envelope (30), which method comprises the step of removing material from the body of the electrode (1) to form a plurality of channels (2) around the body of the electrode such that a channel (2) comprises channel side walls (62) and an essentially concave channel floor (60), and such that depth (dch) of a channel (2) is preferably at most 8 percent, more preferably at most 5 percent, most preferably at most 3 percent of a diameter (De) of the electrode (2). The invention also describes a lamp (3) comprising such electrodes (1), and a method of manufacturing such a lamp (3).