It is often used in words related to light, brightness, or illumination. Here are some examples:
* Lucent: Giving off light; shining.
* Lucidity: Clarity of thought or expression.
* Luciferous: Bringing light; illuminating.
* Lucubration: Writing or study done late at night.
* Lucifer: The name of the morning star, associated with the devil.
However, it's important to note that the prefix "luc" can also be found in words that are not directly related to light, but instead have connections to other concepts like clarity, knowledge, or understanding. For example, "lucid dream" refers to a dream that is remembered vividly and with a high level of clarity.