The ornamental design for the lamp housing, as shown and described.
FIG. 1 is a top plan view of the lamp housing in accordance with the
design;
FIG. 2 is a front side elevational view of the lamp housing in accordance
with the design, the rear side, right side, and left side being
substantially identical thereto;
FIG. 3 is a side elevational view of the lamp housing in accordance with
the design, the view being aligned with the intersection of the front side
and the left side, the view of the intersection of the remaining sides
being substantially identical thereto; and,
FIG. 4 is a bottom plan view of the lamp housing in accordance with the
design.
The broken lines show the environment in which the article is used and are
not considered part of the design claimed.