FIG. 1 is a front-top perspective view of a lamp casing according to an embodiment of the present disclosure;
FIG. 2 is a first side view thereof;
FIG. 3 is a second side view thereof;
FIG. 4 is a third side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken lines shown in FIGS. 1-2 and 4-6 are for illustrative purposes only and form no part of the claimed design.
The ornamental design for a lamp casing, as shown and described.