Board Thread:Suggestions forum/@comment-26149161-20150730224909/@comment-26149161-20150731012404

Elves and dwarves both used crystal lamps.

From the Song of Durin

A  king he was on carven throne In many-pillared halls of stone With golden roof and  silver floor, And  runes of power upon the door. The light of  sun and  star and moon In shining lamps of crystal hewn  Undimmed by cloud or shade of night There shone for ever fair and bright.

http://tolkiengateway.net/wiki/F%C3%ABanorian_lamps