public LightList getWorldLightList() {
        return worldLights;
    }
Returns the world {@link LightList}, containing the lights
combined from all this <code>Spatial's</code> parents up to and including
this <code>Spatial</code>'s lights.

@return The combined world light list
jme3-core/src/main/java/com/jme3/scene/Spatial.java