effulgent
adjective·/ɪˈfʌl.dʒənt/
Shining forth brilliantly, radiant with a clear, spreading brightness. Light here implies overflow, issuing outward as if it cannot be contained.
The mountains were effulgent at sunrise, their snowfields lit as though from within.
Etymology
From Latin effulgēre “to shine forth,” from ex- “out” + fulgēre “to shine.” The word keeps the motion of its origin: brilliance as an outward act.
Related Words
radiantshining; often warmer, more human in feel
resplendentsplendidly bright; more ornate, more courtly
luminouslight-giving or light-filled; calmer
coruscateto flash and glitter; more flickering than steady