Fulgor and fulgurous

Fulgor is an archaic word meaning dazzling brightness, splendour.   

Its adjective, fulgurous, is not mentioned as being archaic and therefore is presumably in current usage.  (Note the change of the 'o' to a 'u' in the word).  It is described as meaning dazzling; amazingly impressive; eye-popping; suggestive of the flashing of lightning or the cracking of a whip; emitting flashes of lightning or similar to lightning.