The Collaborative International Dictionary of English v.0.48:

Effulgence \Ef*ful"gence\, n.
   The state of being effulgent; extreme brilliancy; a flood of
   light; great luster or brightness; splendor.
   [1913 Webster]

         The effulgence of his glory abides.      --Milton.
   [1913 Webster]

         The bright and the balmy effulgence of morn. --Beattie.
   [1913 Webster]

WordNet (r) 3.0 (2006):

effulgence
    n 1: the quality of being bright and sending out rays of light
         [syn: radiance, radiancy, shine, effulgence,
         refulgence, refulgency]