The ornamental design for a lamphousing, as shown and described.
FIG. 1 is a right side elevational view of the lamp housing in accordance
with the design, illustrated in the environment of a lamp, the left side,
front side, and rear side being identical thereto;
FIG. 2 is a bottom plan view of the lamp housing in accordance with the
design; and,
FIG. 3 is a top 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.