Why is my lighting much brighter when launched in standalone game?

Hi guys,

I’m wondering if anyone can help me with a lighting issue: even though in the editor everything seems fine, every time I launch as a standalone game my lighting is going crazily bright. Here are some pictures as an example:

Here is the game running in a new editor window, looking okay. When I launch the game, I get this…

I’ve tried messing around with post-processing but have now removed it as nothing seemed to work, and have also looked at the auto exposure of the camera on the player character, which again did nothing.

Any help would be hugely appreciated! Thanks.