Lamp base

FIG. 1 is a perspective view of a first embodiment of a lamp base showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of a second embodiment thereof;

FIG. 9 is a front view of FIG. 8 ;

FIG. 10 is a back view of FIG. 8 ;

FIG. 11 is a right side view of FIG. 8 ;

FIG. 12 is a left side view of FIG. 8 ;

FIG. 13 is a top view of FIG. 8 ; and,

FIG. 14 is a bottom view of FIG. 8 .

The broken lines shown in the drawings are included for purposes of illustrating portions of the lamp base and form no part of the claimed design.