Lighting Fixture

1. Lighting fixture 1 . 1 is a front perspective view of a lighting fixture. 1 . 2 is a front view thereof. 1 . 3 is a right-side view thereof. 1 . 4 is a top view thereof. 1 . 5 is a left-side view thereof. 1 . 6 is a bottom view thereof. 1 . 7 is a back view thereof. The broken lines illustrate portions of the lighting fixture that form no part of the claimed design. The lighting fixture is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.