FIG. 1 is a left, front, top perspective view of a lamp holder showing my new design;
FIG. 2 is a right, rear, bottom perspective view thereof;
FIG. 3 is a front plan view thereof;
FIG. 4 is a rear plan view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top elevational view thereof;
FIG. 8 is a bottom elevational view thereof; and,
FIG. 9 is a right, rear, bottom perspective view of the lamp holder of FIG. 2 in a using state.
In the drawings, the broken lines depict portions of the lamp holder that form no part of the claimed design.