An alley at night lit only by three neon signs, each a useRectLight and the shape you see on one object. They face out of the wall and tilt down, so the pavement and the crates take each colour in a long band.
A light shines along its own -Z, so a sign on a wall is turned round with rotationY: Math.PI to light the street and not the bricks behind it. The amber one is failing: its intensity drops to zero for a moment now and then.