The ornamental design for a lightingelement for luminaire, as shown and described.
FIG. 1 is a front, upward perspective view of a lighting element for luminaire;
FIG. 2 is a front, downward perspective view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top plan view thereof.
The broken lines are intended for the purposes of illustrating a possible mount useable with the claimed design and form no part of the claimed design.