I have tracked a footage, created a 3d camera. I have created a smoke trail with a light as emitter, which I have moved around z space to reflect the distance properly. However, when I apply the Optical Flare on a solid and set it as "track light", it tracks the initial light emitter, which isn't the one that's tracked by the Camera 3d Tracker (i.e. the origin of the smoke trail). As you can see on the picture, there is a major gap between both, they're just not aligned, and the light emitter not tracked by the camera moves much faster than the smoke trail emitter.