brilliancy

ˈbrɪlj(ə)ns

noun

intense brightness of light.

the nights were dark, lit only by the brilliance of Aegean stars

brightness,vividness,intensity,sparkle,flash,flashing,glitter,glittering,glow,blaze,beam,dazzle,luminosity,lustre,radiance,resplendence,effulgence,refulgence