Moin! 
Very awesome Videos! You give very good tips to avoid unlimited “try and error of doom 3000 des Todes”
Since i wanna start using Unreal für highend Archviz (currently 3dsmax + vray+ fusion) it helps me a lot with lightning and lightmass stuff.
ill check all your sessions and thanks for your efforts!
big fat greetings from cologne, germany
!