- thanks for explanation. In free time I will try to fix this scene and re-render the light maps.Then I will show the results.
**BTW: THANK YOU VERY, VERY MUCH for you effort in developing the rendering part of UE4 ! **
— Maybe you should think about some PATREON. I think that many of us could support you with few of bucks monthly. Just a FB UE4 - group has over 10k members ! $1 from only 1k of members could give you some nice financial support for more coffee and/or beer at work 
— Look at the campaign of the HDRIHAVEN.com —