The experience given by the lamp is the same as a huge prismatic lamp; however, it is impossible to obtain the key before level 96 Slayer, so the following table shows the experience for all possible levels.
This list was created dynamically. For help, see the FAQ.
Upon the release on non-virtual slayer levels past 99 there was a bug where having over level 99 slayer would grant you the experience equivalent at level 1 Slayer from the Raptor Lamp as opposed to the level 99+ experience. This was fixed on 12 June 2016.