Hi there,
I made a new project in UE5 and imported Sun Temple into it and made a comparison video to show how much Lumen GI and Lumen Reflections are different.
This may help those who wants to upgrade their UE4 projects into UE5.
If you want to download the Sun Temple source project you can find it here in the marketplace which is free, made by Epic Games.
https://www.unrealengine.com/marketplace/en-US/learn/sun-temple/