The ornamental design for an ledlampassembly, as shown and described.
FIG. 1 is a perspective view of an LED lamp assembly showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side, elevational view thereof;
FIG. 5 is a right-side, elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the LED lamp assembly of FIG. 1 mounted on a supporting rod, wherein the supporting rod is shown in broken lines for illustration only and forms no part of the claimed design.