Forgive me if this has been covered, but my search fu is exceedingly weak.

I've owned P8 since launch, but don't use it much (I prefer Studio), but I am trying to play with it and learn its new features, etc.

Today I learned about the new light attenuation controls for spotlights and pointlights.

Problem is... it never seems to change.  I start with a completely new scene, create a single spotlight... go to the Attenuation option and select either Inverse Linear or Inverse Square and the display never changes from Constant.

What the hell am I missing? Shouldn't this be as simple as point and click?

 

Even went so far to change my units to PNU, thinking that I might NEED to since the lights work with PNU.  No joy.

Manual is no help.