Definitions for "Natural light"
Planetary illumination from sun, moon, stars, be it indoors or out. Generally has higher color temperature than artificial light, and thus more bluish qualities. (See Artificial Light, Color Temperature.)
Any lighting that exists on location. Either sunlight or electric.
Illumination from sun, moon, or stars--be it indoors or out. Has higher color temperature than most artificial light, and thus a more bluish hue.