Portion of a lighting lamp

FIG. 1 is an isometric view of a top, front, and right side of an ornamental design for a portion of a lighting lamp;

FIG. 2 is a front elevational view of the portion of a lighting lamp of FIG. 1 ;

FIG. 3 is a rear elevational view of the portion of a lighting lamp of FIG. 1 ;

FIG. 4 is a right side elevational view of the portion of a lighting lamp of FIG. 1 ;

FIG. 5 is a left side elevational view of the portion of a lighting lamp of FIG. 1 ;

FIG. 6 is a top plan view of the portion of a lighting lamp of FIG. 1 ; and,

FIG. 7 is a bottom plan view of the portion of a lighting lamp of FIG. 1 .

The dash-dash-dash broken lines are included for the purpose of illustrating portions of the portion of a lighting lamp that form no part of the claimed design. The dash-dot-dash-dot broken lines define boundaries of the claimed design and form no part of the claimed design. Further, the dash-dot-dash-dot broken lines illustrated in FIGS. 1-7 depict how a portion of a lighting lamp may include a varying dimension.