Next time please search before making a post 
This has been addressed many a dozen times in the last month.
This is expected 4.15 behavior due to the tonemapper change.
(you should have read the changelog)
changelog:
Additional discussion:
Next time please search before making a post
This has been addressed many a dozen times in the last month.
This is expected 4.15 behavior due to the tonemapper change.
(you should have read the changelog)
changelog:
Additional discussion: