Columbia subject headings:
English literature--Old English, ca. 450-1100--History and criticism.
Light and darkness in literature.
Light--Religious aspects.
Harvard subject headings:
English literature--Old English, ca. 450-1100--History and criticism
Light and darkness (in religion, folk-lore, etc.)
Light and darkness in literature.
Princeton subject headings:
English literature--Old English, ca. 450-1100--History and criticism.
Light and darkness in literature.
Light and darkness--Folklore.