Illumination lamp

FIG. 1 shows a perspective view of an illumination lamp having the ornamental design of the present invention;

FIG. 2 shows a front plan view of the illumination lamp of FIG. 1 ;

FIG. 3 shows a back plan view of the illumination lamp of FIG. 1 ;

FIG. 4 shows a left side plan view of the illumination lamp of FIG. 1 ;

FIG. 5 shows a right side plan view of the illumination lamp of FIG. 1 ;

FIG. 6 shows a top plan view of the illumination lamp of FIG. 1 ; and,

FIG. 7 shows a bottom plan view of the illumination lamp of FIG. 1 .