The ornamental design for a decorationlamp, as shown and described.
FIG. 1 is a perspective view showing a decoration lamp claimed in this application (“claimed design”);
FIG. 2 is a front view showing the claimed design;
FIG. 3 is a rear view showing the claimed design;
FIG. 4 a left side view showing the claimed design;
FIG. 5 is a right side view showing the claimed design
FIG. 6 is a top plan view showing the claimed design; and,
FIG. 7 is a bottom plan view showing the claimed design.
The claimed design is directed to a decoration lamp, designed using a puppy motif, and it is characterized in that light is emitted from a face-shaped character.