effulgence
A state of being bright and radiant, splendor, brilliance.
countable, uncountable
[…] the clear effulgence of the stars by night […]
Where it comes from
From Latin ex- (“out of, from”) and fulgere (“to shine”). By surface analysis, ef- + Latin fulg(ere) + -ence.
Adapted from the Wiktionary entry effulgence (CC BY-SA 4.0).