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All lighting in the film falls under the category of natural or artificial. Natural lighting could come from the sun, moon, fire or anything else occurring in nature. Artificial lighting is things like streetlights, flashlights, LED lights and even the massive spotlights used in big production films. Ambient lighting is a crucial way to use lighting. It refers to any light the crew didn't bring. This could refer to car headlights, or the most potent ambient light - the sun.