Efficient lamp with envelope having elliptical portions

A lamp comprising:

• a light transmissive envelope comprising two connected elliptical portions that together form a hollow interior, a central portion of said envelope between said elliptical portions, each elliptical portion including a major axis and a minor axis, wherein said major axis is between about 12 mm and 17 mm and said minor axis (mm) is approximately equal to 1.2*(major axis −5);
• an electrically conductive filament disposed in the interior of said envelope, said filament including coiled-coil portions disposed in said elliptical portions in a coiled-coil shape and a single coil interval portion disposed between said coiled-coil portions at said central portion of said envelope;
• sealed end portions of said envelope;
• at least one filament support for positioning said filament near a center of said envelope, wherein the at least one said filament support includes side filament supports near said end portions and a central filament support in said central portion of said envelope;
• and
• gas contained in the interior of said envelope.