radiancy(n = noun.attribute) effulgence, radiance, refulgence, refulgency, shine - the quality of being bright and sending out rays of light;
is a kind of brightness
has particulars: gleam, gleaming, glow, lambency, luster, lustre, sheen, shininess, burnish, gloss, glossiness, polish
Derived forms adjective radiant₁, verb radiate₁

   The quality of being radiant; brilliancy; effulgence; vivid brightness; as, the radiance of the sun. [1913 Webster]
"Girt with omnipotence, with radiance crowned." [1913 Webster]
"What radiancy of glory,
What light beyond compare !" [1913 Webster]