This is driving me crazy… I started a project and have been wokring on it for a while and started blocking in lighting, however when previewing the game with game view the lighting becomes darker even in new levels. Which leads me to believe it’s a project setting or something. My projects dont have this problem.
Please help 
I think you have a problem with the exposure issue.
if this not working as expected for you, try to add PostProcessing volume and play with the exposure the way u want
I tried both the post process exposure and the exposure in the viewport. Both didnt work sadly
One think that could help is some screenshots, but maybe it has to with eye adaptation but if all else fails you could always raising the brightness with post processing.
But just another question just in case, I mean I don’t know what’s happening (Again screenshots could clear this up for me) but you wouldn’t happen to have your viewport on unlit.
you could also have some show flags disabled. click show>use Defaults to get things to normal if that is the case.
Here are the two viewport with Game view on and off.
Okay! Solved it. Something wrong with my Config files so I replaced them with a new project’s.
