Lucent: 1. giving off light. 2. easily seen through.
Lucid: clear in meaning. As if light were shining through it.
I hope the definitions I provide in my vocabulary blog are lucid.
Lucubration: 1. hard and difficult study. 2. the product of hard study.
Lucubration is a word that initially meant, 'study by lamplight'. You had to be pretty motivated to keep studying after dark in a time before electricity, hence its meaning, "hard study". If you know anyone who has studied for the bar they could explain.
Translucent: partly transparent. i.e. light can partially shine through.
A good thief, con-artist, or criminal of any type would NOT be translucent although would attempt to appear as such.
Elucidate: to clarify by explaining. Explain. "to shed light on"
Let me elucidate the name Lucifer.
Lucifer: "light-bearer" or the name Satan had before he fell from heaven.
Myth holds that Satan was once God's right hand man, whose job it was to bring light, but he was eventually thrown from heaven because of his insubordinate pride. When I think of something that produces light I think about the sun. The sun seems pretty important: it holds our planet in place, produces much of the light we see, enables all living things on this planet to survive, and has even occasionally been worshiped as a God. Similarly Lucifer, a creation of God, thought he was more important than God. Demonstrating poetic irony, God damns Lucifer to hell, the hottest and most fiery place in the universe. I don't know what images this conjures for you but this reminds me of the sun.