refulgent
Resplendent, or shining brightly and radiantly.
As if giving off light or warmth.
figuratively
She had a refulgent smile.
Where it comes from
From Latin refulgentem, accusative singular of refulgēns, present active participle of refulgeō, from re- (“back”) + fulgeō (“shine”). By surface analysis, re- + Latin fulg(ere) + -ent.
Adapted from the Wiktionary entry refulgent (CC BY-SA 4.0).