A light orb is a common artifact. Light orbs use a simple sustain rune to keep a light spell active within it. The orb can be illuminated by casting light into it, and extinguished by casting light into an illuminated one. While active, the light orb will emit a bright light in all directions illuminating a 10 meter sphere.
Light orbs are the preferred method of illumination in cities that can afford them, since light magic is less common among hoodlums and pranksters who would put out fire based lamps. Lamplighters proficient in light magic are hired to keep the lamps illuminated and repair or replace broken ones.
A similar object is a darkness orb.