The ornamental design for a lampassembly for electricalconversion of a gasstreetlamp, as shown and described.
FIG. 1 is a side view of a lamp assembly for electrical conversion of a gas
street lamp showing our new design, the opposite side being substantially
identical;
FIG. 2 is a front view thereof;
FIG. 3 is a bottom view thereof on an enlarged scale;
FIG. 4 is a top view thereof on an enlarged scale.