Light bulb filament

[0001]FIG. 1 is a front elevational view of a light bulb filament, showing the new design;

[0002]FIG. 2 is a rear elevational view thereof;

[0003]FIG. 3 is a top plan view thereof;

[0004]FIG. 4 is a bottom plan view thereof;

[0005]FIG. 5 is a left-side elevational view thereof;

[0006]FIG. 6 is a right-side elevational view thereof; and,

[0007]FIG. 7 is a front, right-side, top perspective view thereof.

[0008]The broken lines depict parts of the light bulb filament that form no part of the claimed design.