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There are two types of Luck: Global Luck and Gathering Luck (Logging, Harvesting, Mining, Skinning and many different perks for fishing)


Global Luck
- increases the potential for low drop-chance items to be earned
- increases the chance that the weapon/armor will be named
- increases the chance that that other items than weapon/armor will be rare
- does NOT effect inventory caches

Best item to have luck on are your bags (for example: Artisans Satchel).
Luck on your weapon/shield is NOT active when looting a chest (since you sheathe them).


Gathering Luck (Logging, Harvesting, Mining, Skinning)
- improves the chance that the player receives additional rare components (for example gems while mining)


That information comes from a forum post, which got unfortunately deleted with the forum.