Lucas shares its root with the Latin lux, light, and the name is often read as describing illumination in a literal sense -- clarity brought into a space rather than metaphorical enlightenment alone. It suggests someone whose presence tends to make things easier to see, plainly rather than dramatically.
Saturn governs Contemplation and Memory, Mars boldness and fortitude, if they want not strength, or are ill disposed. - William Lilly (1602.-1681.)