Light Bulb Filament

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

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

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

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

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

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