noun
effulgence
ih-FUL-juns/ɪˈfʌldʒəns/
Brilliant, shining light.
The sun's effulgence fills the valley with brilliant morning light.

Etymology
“Out” and “shine” combine in the image of light gleaming forth. The noun names that radiant shining, connecting the outward gleam with brilliant brightness.
In context
Under the gas-lights of the chandelier hung a cluster of electric light bulbs which added to the flood of golden effulgence that bathed the room and all things in it.
More examples
- Fresh snow reflects the effulgence of the midday sun.
- The chandelier's effulgence lights every corner of the ballroom.
- Clouds briefly hide the full moon's effulgence.
Forms
effulgence
effulgent adjective — Shining with a brilliant, radiant light.