The ornamental design for a lampshield, as shown and described.
FIG. 1 is a perspective view of the lamp shield of the present invention;
FIG. 2 is a first side view of the design of the present invention; the second side view, not shown in the drawing disclosure, is a mirror image of the first side view;
FIG. 3 is a bottom view of the design of the present invention; and,
FIG. 4 is a first end view of the design of the present invention; the second end view, not shown in the drawing disclosure, is a mirror image of the first end view.
The broken lines shown are included for the purpose of illustrating environmental structures and form no part of the claimed design. The break in the design defined by jagged lines indicates that the design is of no specific length.