General:
* Luminary: A person who is an inspiration or a source of light in their field (e.g., a famous scientist, a great artist).
* Luminous: Emitting or reflecting light, shining brightly.
* Luminosity: The quality of being luminous; brightness.
* Luminescence: The emission of light by a substance that is not caused by heat.
Scientific:
* Luminescent: Relating to or producing luminescence.
* Bioluminescence: The emission of light by living organisms.
* Photoluminescence: The emission of light by a substance that has absorbed light.
* Chemiluminescence: The emission of light from a chemical reaction.
Other:
* Illumination: The act of illuminating; the state of being lit up.
* Illumine: To light up; to enlighten.
* Luminousness: The quality of being luminous; brightness.
* Luminiferous: Carrying or conveying light.
* Luminiferous ether: A hypothetical medium that was once thought to carry light waves.
These are just a few examples. "Lumin" is a versatile root that can be used to create words related to light, brightness, and knowledge.