φωτινὸν [3 verses](adj sg neut nom) "Full of light" is photeinos, which means "shining," and "bright." It is a metaphor for "clear," and "distinct." -- The Greek word translated as "full of light" means "shining" and "bright." It has no sense of "full of." Since Jesus uses light as a metaphor for knowing, the term "bright" works well because in English it means "intelligent." However, there is also a sense of "successful" and "well-known," as we might say that someone has a "bright career" or is a "bright star" in their profession.  For more on the words used to mean "light" refer to this article.