Same Light settings but different output

Hey,

This is my level in 4.12.5 :

and this is the level in 4.13 preview 1 (compiled from UE4.13 branch)

the settings of Post Process,Light,Skylight and render options are the same.

Any idea on why it’s so bright?Thanks.

Sorry but it won’t let me edit my post :

4.12

4.13