Medium XP lamp (Battle of Lumbridge) was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
A medium XP lamp is a purchased reward from the Battle of Lumbridge, which grants the player 94% of the experience a medium prismatic lamp would give. The experience gained is the same from level 98 to 120. After the week 9 vote, the store price was reduced to 665 renown.
In a hidden update on 13 August2013, all 3 tiers of lamps were merged into the same item. Originally the Tier 2 medium lamp cost 800 renown and required a silver token, while the Tier 3 medium lamp cost 900 renown and required a gold token.
The experience of the Tier 1 lamp used to be 95% of a normal Squeal of Fortune lamp, and a Tier 2 lamp granted the same amount of experience as a SoF lamp.