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Fishing Lamp was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
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Fishing Lamp (Prifddinas Waterfall Fishing Shop) detail

A Fishing lamp was a reward available from the Prifddinas Waterfall Fishing Shop for 300 crystal urchin points. The lamp gave 3,000 Fishing experience, regardless of your fishing level.

On 3 October 2016 this item was removed from the shop, and experience is instead bought directly.