Hi , thank you for your reply - you are right in all points and this is actually our first attempt awhile back at using Unreal Engine ( UE 4.6 ) and I purposefully didn’t go crazy with the geometry for the sake of quick render iterations. I use to use Spotlights for indoor GI but we moved on since and we are currently using Raghu’s method like most folks here. I’m actually just showing off our very early works for the purpose of documentation. I saw a similar thread here I think it was a Korean team and I just wanted to follow the same format they are doing-- just thought it was interesting. :]