In Action, a lens flare is a child of a light. Multiple lights can be parented to the same Lens Flare object.
To add a lens flare to the scene.
A default lens flare (including a Lens Flare object, Border FX object, and multiple component texture objects) is added to the schematic. In Result view, you can see the lens flare (you may need to move the light in the scene to see the full lens flare effect).
If there is only one light in the scene, the lens flare node is automatically connected to it. If there are several lights in the scene, select the light in the schematic that you want parented to the lens flare before added the lens flare node. Otherwise, you can parent the lens flare node to the light or lights manually in the schematic.
You can also add a Lens Flare using the Presets node. See Using Lens Flare Presets. In this case, a light is automatically added as part of the preset.