Here are a selection of projects showcasing lighting breakdowns done in Unreal and Unity engine.
Projects found here:
https://www.artstation.com/artwork/8QRbG
https://www.artstation.com/artwork/32xXY
https://www.artstation.com/artwork/mRE0y
https://www.artstation.com/artwork/v5amA
https://www.artstation.com/artwork/1r1yZ