Strong's G541 — ἀπαύγασμα (noun)
apaugasma (ap-au'-gas-mah) n.
1. an off-flash, i.e. effulgence
[from a compound of G575 and G826]
KJV: brightness 
Root(s): G575, G826 
Hebrew root: αὐγάζω
Occurrences: 1