Hi everyone, I've a simple question and sorry if it was asked earlier.

How do I switch back to Mental ray's default light after other lights has been setup?

I need to check textures frequently and rendering with all lights is expensive. I tried creating a new render layer with no lights but no good.(which by the way used to work with Maya software)
Exporting the lights and deleting them afterwards works but I loose my light linkings. So still no good.

Please share your workflow methods on approach to lighting and texturing a scene. I'm still a noob.