The Collaborative International Dictionary of English v.0.48:

Refulgence \Re*ful"gence\ (r?*f?l"jens), Refulgency
\Re*ful"gen*cy\ (-jen*s?), n. [L. refulgentia. See Refulgent.]
   The quality of being refulgent; brilliancy; splender;
   radiance.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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