is a specific kind of: brightness.

is a broader term that covers: gleam, gleaming, glow, lambency | luster, lustre, sheen, shininess | burnish, gloss, glossiness, polish.

derivation: radiate | shine | beam, shine | reflect, shine | radiate | beaming, beamy, effulgent, radiant, refulgent | glazed, shiny | bright, burnished, lustrous, shining, shiny.