Spectral Rendering Conversion Intent

Toonces

If I change this from 'faithful' to 'natural' and have Environment Mode set to Scene Only, no light appears in Iray Viewport.

All I have in the scene is G8F and a default Spot Light (with 500000 Lumen).

If I change the light geometry from Point to Rectangle, I get a *little* light, but doesn't make sense why that would have such an effect. Any ideas?

 

nathan_21017e34

I'm going bonkers trying to find the answer to this too, but no one seems to know. 

I have four lights staged lighting up my character and I'm using a HDRI background set up as a finite sphere wiyh ground. All lights work perfectly when I have spectral rendering set to faithful, but as soon as I switch to natural, it turns all my lights off - ARGHHH!!!!!!!!

I much prefer the naturalistic photographic rendering that the 'natutral' Spectral intent gives me, but why the heck can't I still have my fill lights?!?!?!?!! HELP