Huge XP lamp

A huge XP lamp is a super rare prize rewarded from the Squeal of Fortune, which grants the player a definite amount of experience scaled to the selected skill level. It grants twice the experience of a large one, four times the experience of a medium, or eight times the experience of a small one. As with most lamps, this item may not be stored in a Bank. The experience gained stays constant from level 98 to 120.

If the player receives one of these lamps, it is highly recommended to utilise it on a skill that is either expensive, such as Prayer, or time-consuming, such as Slayer.

Should a player not want to use the lamp, they may convert it to a 500k Coins reward from the Squeal of Fortune interface.

As of an update on 12 October 2012, skill-specific huge lamps in Construction, Crafting, Farming, Herblore, Smithing and Summoning have been replaced by crates containing training items for the skills.

Note: If using a huge XP lamp on Dungeoneering, dungeoneering tokens will not be received.

The following is an XP table detailing the number of experience received from a huge lamp for any given skill level:

Experience Gained Formula
Below is a polynomial formula which loosely approximates the experience gained in a skill at level x. $$XP = 0.00142607098x^4 - 0.119998437x^3 + 5.8695973x^2 + 663.796486$$

Trivia

 * Winning a huge XP lamp on the Squeal of Fortune does not produce an event on one's adventure log.