Light Excluder is a script for 3ds Max from developer Chuggnut, built around a single task: including or excluding objects from lights. The workflow is direct — select the lights and the object you want to include or exclude, then press the button to apply the setting.
The tool stays focused on that one action, which the developer describes as a simple light excluder. It is currently at version 2.3.5.
Light Excluder is listed in the ScriptSpot library and is available here as free. For the current release, licensing details and any additional notes, the developer's page at chuggnut.com is the place to check. If you regularly set which objects a light does or does not affect in 3ds Max, the script reduces that to a selection and a button press.