The ornamental design for a lanternlightcolumn, as shown and described.
FIG. 1 is a perspective front view of a lantern light column in accordance with my invention;
FIG. 2 is a front view thereof;
FIG. 3 is a right view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The surface indicia of parallel lines indicate mirror surfaces. Throughout the drawings the broken lines illustrate unclaimed subject matter only and form no part of the claimed design.