https://www.etymonline.com/word/*kand-# ... ne_v_53161
also *kend-, Proto-Indo-European root meaning "to shine."
It forms all or part of: candela; candelabrum; candescent; candid; candidate; candle; candor; chandelier; chandler; frankincense; incandescence; incandescent; incendiary; incense (n.) "substance producing a sweet smell when burned;" incense (v.1) "to provoke, anger."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit cand- "to give light, shine," candra- "shining, glowing, moon;" Greek kandaros "coal;" Latin candere "to shine;" Welsh cann "white” […]
From Proto-Italic *kandēō, from Proto-Indo-European *(s)kand- (“to shine, glow”).