This official news post is copied verbatim from the WoTMUD website. It is copyrighted by wotmud.org.
Previously:
Torches: 15 hours
Lanterns: 60 hours
Mirrored Lanterns: 90 hours
Storm Lanterns: 1200 hours
Crystal Lighsticks: 2000 hours
Now:
Torches: 60 hours
Lanterns: 240 hours
Mirrored Lanterns: 360 hours
Storm Lanterns: 900 hours
Crystal Lightsticks: 1500 hours