Patent ID: 8011798

Claim:
A halogen incandescent lamp for motor vehicle headlamps with two incandescent filaments which are arranged within a lamp vessel, and are each in the form of a single coil and which are constructed in such a way that their dimensions and/or their geometry are in each case matched to an operating voltage of at least 20 volts, a first incandescent filament being designed for operation at a higher electrical power than a second incandescent filament wherein the dimensions and/or geometry of the first incandescent filament is matched to an electrical power consumption at 28 V in the range of from 50 watts to 100 watts wherein the dimensions and/or geometry of the second incandescent filament is matched to an electrical power consumption at 28 V in the range of from 15 watts to 50 watts the length of the single coil of the second filament being in the range of from 3.5 mm to 5.5 mm, the outer diameter of the single coil of the second incandescent filament being in the range of from 0.5 mm to 1.4 mm, the diameter of the filament wire of the single coil of the second incandescent filament being in the range of from 40 micrometers to 110 micrometers and the single coil of the second incandescent filament having at least 30 turns.