When testing how the lights in Renditioner work here are some things to try.
1. Choose the Architectural Presets
2. Set your background to "Black"
3. For Lighting use "Night", this is found in the Exterior Lighting group
4. For lighting options set the Ambient lighting scale to 0.0. Ambient lighting adds light evenly to the entire scene. Turning it off lets you see only the Renditioner lighting elements.
The attached movie shows how do this...there is no audio