Soldato
Mines doesn't go dark, it's more a very light change in hue/contrast.
The actual output though is astounding tbh, testing via this page:
http://www.testufo.com/#test=photo&photo=toronto-map.png&pps=960&pursuit=0&height=0
You can read the street names via lightboost, where as it's only blur you get on normal mode.
Maybe activate lightboost after the game launches?
Can't be bothered with that every time I play a game.
I did test on something like that and it was better. Not life changing better, but there was a difference.
I think for mine it was a combination of looking darker and some hue/contrast issues.
If it wasn't for this and the hassle of setting it up I would use it, but I didn't think the difference made was worth the effort or putting up with the colour change.
It's the same sort of reason that while I'm interested in FreeSync/GSync I'm not overly bothered by it as again I don't see it making too much difference in the games I play that sit at pretty much 120fps constantly.