I've been analyzing different render engines to see how they tackle tonemapping. One engine that stands out, and this has become the new vray meme, is fstorm.
My test scene has been 14 100x100cm planes that range from 1 light intensity to 14 (The range Corona currently support in log, ACESlog support please :( ). I've been testing white, red, green, blue.
I noticed that if you leave all the fstorm tonemapper settings at 0, it will still affect how light intensity behaves.
Linear 1 light intensity to 14
fstorm 1 light intensity to 14
Corona 20 HC
After reading a bunch of articles about ACES and XYZ space, I noticed that this behavior happens to the linear render when you go into XYZ space.
XYZ 1 light intensity to 14
ACES in 1 light intensity to 14
ACES back to sRGB 1 light intensity to 14
I'm no expert when it comes to this stuff, so I'm interested in hearing what you guys think.