Both Uses of

Enlightenment
in
The Fountainhead

Guy Francon, of the illustrious firm of Francon & Heyer, vice-president of the Architects' Guild of America, member of the American Academy of Arts and Letters, member of the National Fine Arts Commission, Secretary of the Arts and Crafts League of New York, chairman of the Society for Architectural Enlightenment of the U.S.A.;
Chpt 1.2

enlightenment = increased understanding

He gathered from its roar that he had graduated with honors, that the Architects' Guild of America had presented him with a gold medal and that he had been awarded the Prix de Paris by the Society for Architectural Enlightenment of the U.S.A.—a four-year scholarship at the École des Beaux Arts in Paris.
Chpt 1.2 *

Definitions:

(1) (enlightenment as in: provided for your enlightenment)
a state of increased understanding

Occasionally, enlightenment can refer more specifically to an elevated spiritual state. In Buddhism & Hinduism is would refer to achieving nirvana.
(2) (Enlightenment as in: during the Enlightenment...)
generally interpreted as a 17th & 18th century movement that further advanced the use of reason in the reappraisal of accepted ideas and social institutions -- especially in Britain, France, Germany, and the American colonies
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, enlightenment may be used as a proper noun with a non-standard specialized meaning.