The source of light for the head torch is high above the player. As a result, walking through some portals casts strange shadows and lighting rooms with low ceilings does not work.
https://www.youtube.com/watch?v=2pKu7cM6RtA
Ignore the brightness. NVidia ShadowPlay always records much brighter than it appears in game.
Version: 0.63.149386
Server: DayZ US Southwest 0-3 (Experimental/Unstable)
IP: 23.229.113.130:150863872
Time: 13:00 PST November 9, 2018