The hair generates an object at render time which I can’t access so include / exclude from lights works fine for the source geometry but unfortunately not for the hair!
You might be able to do something with pre-render MaxScript callbacks - I think the hair object should be created at that point, so you can add it to the light’s exclude list.
Another solution might be to use “include” lists for the lights.
Best regards,
Vlado
Good call on the callbacks!