Abstract: In a high-power dual-filament incandescent lamp for use in a reflector having an optical axis, which incandescent lamp comprises two incandescent coils which are substantially parallel to one another, which in their correct operational positions are arranged substantially parallel to the optical axis of the reflector in a lamp bulb, and which can be operated alternately, the glass bulb is arranged such that it shows a horizontal and vertical displacement relative to the optical axis of the reflector when in the correct operational position.

Abstract: The cap (10) of the capped electric lamp (1) has a resilient member (14) which acts transversely to the axis (10') of the cap. This allows the lamp to be used in a lighting system having the lamp and a reflector (40), in which the reflector is of a simple construction. The resilient member (14) presses transverse reference locations (13) of the cap against flat mounting surfaces (50) in the reflector, which are located on the legs of a V. The cap (10), and thus the electric element (3) inside the lamp vessel (2), are as a result accurately positioned in the reflector in two directions transverse to the axis. The cap (10) may in addition have projections (23,24,25) distributed over its circumference, each having an axial reference location (12), by which the cap is axially aligned in the reflector (40) through cooperation with surfaces (49) ridge portions (46,47,48) of the reflector.