FIG. 1 is a front-top perspective view of a lamp casing according to an embodiment of the present disclosure;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a first side view thereof; and,
FIG. 5 is a second view thereof.
The broken lines shown in FIGS. 1-2 and 4-5 are for illustrative purposes only and form no part of the claimed design.
The ornamental design for a lamp casing, as shown and described.