Glad you brought up Share International. Here's a link to an FAQ on that site.
Alice Bailey founded the Lucifer Trust, which she later changed to the Lucis Trust -- what did she mean by 'Lucifer'?
A. Lucifer is the name of a great Angel, not an upstart in heaven who revolted against God and was put down into the nether regions as the Devil. That is a complete misinterpretation. Lucifer means light, and comes from the Latin lux, lucis, meaning light. It is the name of the Angel Who ensouls the human kingdom; every person, therefore, is a fragment of Lucifer. According to the esoteric teaching, the human souls individualized 18-and-a-half million years ago. Lucifer, the Oversoul, diversified itself, and each fragment became individualized.
http://www.share-international.org/A.../faq_basic.htm