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 front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the Figures are included for the purpose of illustrating unclaimed portions of the lighting element for luminaire and form no part of the claimed design.