Single-ended compact halogen discharge lamp and reflector combination

Claim 1

Compact reflector lamp having a single ended light source including a discharge vessel (1); a single pinch or press seal (3) at an end of the discharge vessel; a fill of mercury, a noble gas, and metal halides within the discharge vessel; two electrodes (4, 5, 7) extending through the pinch seal into the discharge vessel and outside thereof; a base (9) at one end of the pinch or press seal; terminal elements (11) secured to the base, and electrically connected to the electrodes; and a curved reflector (2) defining a light emission opening (17), said reflector being formed with an opening (8) at a central region thereof remote from said light emission opening to permit passage of the discharge vessel therethrough, and defining a reflector axis passing through said opening said base (9) being retained in said opening, and comprising, in accordance with the invention, means for controlling the color temperature of the light emitted by said light source by controlling the operating temperature parameters of the light source, including a transparent tubular element (14, 19, 29) separate from said light source closely surrounding the discharge vessel, said tubular element being positioned in the direction of said reflector axis; means (10, 16'; 16a, 21, 27) for seating a first end portion (16) of said transparent tubular element (14, 19, 29) on the reflector in the region of the reflector which surrounds said opening (8); and means (15', 24, 28) for closing a second end portion (15, 26, 30) of said transparent tubular element remote from said first end portion, said tubular element being closed by said seating means, the reflector, and said base, and by said closing means and defining a heat retention and heat damming chamber to thereby control the operating temperature of the light source.