Patent ID: 7990041

Claim:
A low-pressure mercury vapor discharge lamp ( 1 ) comprising a glass vessel ( 2 ) enclosing a discharge space ( 3 ), the glass vessel ( 2 ) provided with at least one glass stem ( 13 ) located within an end portion of the glass vessel ( 2 ), and also comprising a container ( 16 ) encapsulating at least one plug ( 18 ) of amalgam, the container ( 16 ) being provided with an opening ( 21 ) enabling gas exchange between the amalgam plug ( 18 ) and the discharge space ( 3 ), the container ( 16 ) also being provided with at least one spacer ( 19 ) located between the amalgam plug ( 18 ) and the opening ( 21 ), to restrain movement of the amalgam plug ( 18 ) within the container ( 16 ), the lamp ( 1 ) being characterized in that the container ( 16 ) also includes means ( 20 ) for restraining the movement of the spacer ( 19 ) within the container ( 16 ).