The assembly of the lamp and extending means.

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An energy-saving assembly of an elongate low-pressure mercury vapor discharge lamp ( 1 ) and at least one elongate extension ( 2 ). The low-pressure mercury vapor discharge lamp includes a light-transmitting discharge vessel ( 10 ) enclosing, in a gastight manner, a discharge space ( 15 ) provided with a filling of mercury and a rare gas mixture. The rare gas mixture includes at least 50% by volume of krypton. The discharge vessel is provided with a luminescent layer ( 13 ). Electrodes ( 4 a; 4 b) are arranged in the discharge space for maintaining a discharge in the discharge space. The extensions are provided for connection to the low-pressure mercury vapor discharge lamp. The extension includes an inductance ( 3 ). The length of the low-pressure mercury vapor discharge lamp together with the length of the extension is adapted to fit a pre-determined mounting distance of tow-pressure mercury vapor discharge lamps.