Lamp/Lightsource - Solo Switch

As an Lighting artist/TD I always loved the option to kill all the other lights but the selected active one. Extremely helpful when you light a complex scene. It would be also nice if it would work with Cycles emission materials. At the Lamp properties it would be cool to have a "Solo" radio button, if it turned on that's the only lamp working in your scene, you can tweak it, fine tune it, see the effect on the scene then turn back all the already set lights. (awesome to find weird light problems, reflection check etc... believe me, life saver with more than 50 lights in a scene)