
If you use the empty to focus the lights like I do you can link it to your scene to make it so you can move it around in your scene. You can also link the camera if you want to have control of it in your scene. Select your light scene
Then select the empty(Or any objects you want to link to your scene). Then press ctrl+L->Link Objects to scene->Your scene name. Default is Scene.

Then switch back to your scene you now can work with the empty(Or the objects you linked) in your scene.