The ornamental design for a hamburgerlamp, as shown and described.
FIG. 1 is a raised elevational side view of the hamburger lamp, all sides
being essentially the same except for the site for attachment to a pole or
bracket.
FIG. 2 is a top plan view of said lamp.
FIG. 3 is a bottom plan view of said lamp; and,
FIG. 4 is an elevated side view of said lamp showing the site for
attachment to a pole or bracket.