If the text hadn’t explained it, I wouldn’t have recognised it, but this is an “extinguished light” of which Cooper Connor says:
The extinguishment of light was the ancient symbol of the direst punishment for crime. Ezekiel xxxii: 7, says: “And when I shall put thee out (extinguish), I will cover the heaven, and make the stars thereof dark.” How forcibly is this thought brought to the mind of the neophyte in this ceremonial.
Shibboleth Templar Monitor by George Cooper Connor (1894)