The Beings of Light are a mysterious race that travel using the Ship of Lights. Called angels by the primitive people on Kobol, these creatures helped them develop the civilization that would become the Twelve Colonies (War of the Gods). Apparently mistakes were made, and they seem reluctant to interfere directly with the Colonials or the Terrans, although they help Apollo and the Galactica save the Terrans from themselves (Experiment in Terra). Count Iblis is a fallen member of this race who has chosen to use his powers for darker purposes (War of the Gods).
Galactica 1980
Angela who appears in the Galactica 1980 episode Return of Starbuck wore white, appeared and disappeared suddenly, and spoke in riddles. Although never stated, it seems likely she was another Being of Light. She was revealed to be the mother of Doctor Zee, and this seems to account for the young Doctor's superhuman abilities.
A later episode of Galactica 1980, which was never filmed, would have had Starbuck rescued from a lonely asteroid by more representatives of this mysterious race.