Synonyms for Beamy (same or very similar meaning)
WordNet sense 1 (having great (or a certain) extent from one side to the other):
broad, wideWordNet sense 2 (radiating or as if radiating light):
effulgent, radiant, refulgent, beamingWordNet sense 3 (emitting or reflecting light readily or in large amounts):
brightFrom the ODE community, based on WordNetadd/edit