Abstract: The high pressure discharge lamp has containment structure in the outer envelope which encloses the discharge vessel. The containment structure consists of a glass cylindrical sleeve closed at its ends by a metal plate. The plates, the cylindrical sleeve and the discharge vessel are combined as a subassembly. The metal plates are provided with tongues bearing on the glass cylindrical sleeve and the outer envelope. The lamp has a flexible conductor which extends from the current lead-through conductor remote from the stem to the lamp stem and bears on the outer envelope. The containment structure prevents failure of the outer lamp envelope in the event of explosive failure of the discharge vessel.

Abstract: Electric gas discharge lamp having a stem and a discharge vessel accommodated in an outer envelope. Resilient elements constituted by a bent wire piece are mounted on a free end portion to secure the frame and discharge vessel within the outer envelope. The bent wire pieces have a curved portion which engage the inner surface of the outer envelope which prevents scratching of the outer envelope during insertion of the stem frame into the outer envelope during lamp assembly.