Scale Issue

Im working on a game project, My character is exactly 6ft and im trying to make a huge room for him so he appears like 2 inches big. Everything works fine except the lightning. if I have the room normal sized the lightning is fine but when i scale the room 30 times bigger than normal the shadows/lightning break and looks werid. I tried playing with the directional light/world settings etc. Im new to unreal engine and getting help with this issue would be much appreciated.