Darker lighting in Gazebo11 compared to Gazebo9

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For the same world files(.world), with the same lighting parameters, the scene is much darker in Gazebo11 in comparison to Gazebo9 on GPU and CPU. Decreasing the lighting attenuation in Gazebo11 tends to help in making the lighting similar. Is this an expected rendering behavior between gazebo11 and gazebo9? If not, to what extent are world files transferable between gazebo9 and gazebo11?

Ref: https://github.com/osrf/gazebo/issues...