Lighting creates atmosphere through the use of:
Spot or wash.
It can be static or moving, take the eye away from or highlight/advertise features and draw people into areas e.g. retail. Alternatively it can be purely functional to illuminate external areas for safety reasons.
Appropriately designed lighting offers the ability to change atmosphere and mood. Balanced with sound (and vision) well-designed lighting provides an environment that is great for your customers and great for your business.