WordNet (r) 3.0 (2006):

light show
    n 1: a display of colored lights moving in shifting patterns

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "light show":
   burelage, burlesque show, carnival, circus, coochie show,
   cosmorama, cyclorama, dance, dancing, diorama, display, exhibit,
   exhibition, exposition, fantoccini, flicker, flickering,
   flickering light, floor show, flutter, fluttering, galanty show,
   georama, girly show, glancing light, hootchy-kootchy show,
   iridescence, iridization, irisation, lambency, leg show,
   magic show, moire pattern, myriorama, nacreousness,
   ombres chinoises, opalescence, pageant, pageantry, panorama,
   parade, pearliness, peep show, phantasmagoria, play,
   play of colors, play of light, pomp, presentation,
   psychedelic show, puppet show, quiver, quivering, raree-show,
   rep show, repertory show, representation, rodeo, shadow show,
   shifting scene, show, sideshow, sight, spectacle, stage show,
   tableau, tableau vivant, the big top, variety show,
   vaudeville show