The distance at which meshes become illuminated is noticeably greater:
For a "10 pt" magnitude, the treshold seemed to be ~1500 ingame units, versus ~700 in vanilla (without code patch; ~900 with MCP)
(in 0.41. May 04 nightly)
(RM-3890 from redmine: created on 2017-06-01 by rot tor, )