Lightmass: multi-bounced sky lighting

Development Rendering
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I did some tests:

1) UE4 17.2 with multibounce tweaked UnrealLigthmass.exe
Quality=MEDIUM / SLLS=0.2 / NILB=13 / NSLB=n/a / ILS=0.75
Time=–/–

UE4-17-1-tweaked-[Q=MED, SLLS=0,2 NILB=13, NSLB=na, ILS=0,75].jpg

2) UE4 18.1 Prev 1 - stock lightmass
Quality=MEDIUM / SLLS=0.2 / NILB=13 / NSLB=1 / ILS=0.75
Time=1000sec (36 CPU threads)

UE4-18-0P1-cam0[Q=MED, SLLS=0,2 NILB=13, NSLB=1, ILS=0,75]-1000sec.jpg

3) UE4 18.1 Prev 1 - stock lightmass
Quality=MEDIUM / SLLS=0.2 / NILB=13 / NSLB=13 / ILS=0.75
Time=1013sec (36 CPU threads)

UE4-18-0P1-cam0[Q=MED, SLLS=0,2 NILB=13, NSLB=13, ILS=0,75]-1013sec.jpg

I have to say that 18.1P1 with NILB & NSLB>10 gives very nice results

info:
SLLS - Static Lighting Level Scale
NILB - Num Indirect Lighting Bounces
NSLB - Num Sky Lighting Bounces
ILS - Indirect Lighting Smoothness