Something effulgent radiates light. On a clear day the sun can be quite effulgent. You might need a pair of shades.

Effulgent comes from the Latin ex meaning "out" and fulgere meaning "to shine". A light that is effulgent, shines out or radiates. A personality that is effulgent radiates warmth and goodness. When you're in love, you have an effulgent or radiant look, as though sunlight were shining from your eyes.

Definitions of effulgent

adj radiating or as if radiating light

“the effulgent daffodils”
beaming, beamy, radiant, refulgent
emitting or reflecting light readily or in large amounts

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