What's the difference between elucubration and lucubration?

Elucubration

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Definition:

• (n.) See Lucubration.

Example Sentences:

Lucubration

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Definition:

• (n.) The act of lucubrating, or studying by candlelight; nocturnal study; meditation.
• (n.) That which is composed by night; that which is produced by meditation in retirement; hence (loosely) any literary composition.

Example Sentences:

• (1) Certainly, almost no one seriously addressing the subjects of place and memory – whether in fiction, film, photography or academia – now does so from beyond Sebald's shadow (his writerly camp followers are legion, immediately identifiable by their melancholy lucubrations, the black-and-white photographs that stud their paragraphs, their flourished fetishes for skulls and for silk …).