Lighting is the use of light to provide a practical and aesthetic environment for people. It can also refer to the arrangement of lights, or combinations of lights, and the effects of lights on the environment. Lighting has been used since prehistoric times. It features in different cultures, anywhere from campfires to artificial lighting. As technology has advanced, so has lighting. Now, from small bedside lamps to huge theater lighting rigs, lights are everywhere. Humans rely on lighting for a variety of tasks. From performing surgery to reading books, lighting makes it possible. It can also brighten up a room and be used to create sets or ambiance. Lighting has been used to add a psychological effect in an environment. Restaurants may use soft, warm lighting to make diners feel comfortable. Hotels may use led-lights to set a mood of luxury and elegance. Lighting has a major impact on our lives. It is often not noticed until it is off. Indoor and outdoor lighting can be used to boost productivity, safety and visibility. It can also reduce energy costs and make people feel more alert. Lighting can be used to show off products and make them look inviting. Stores may have bright, colorful lighting to show off clothes or other items. Homeowners may use low lighting in hallways to highlight artwork. Lighting can add aura and mystery. Theater choreography may use lighting to set the stage for action. Film set lighting can set the tone of a scene and establish an emotional landscape. Lighting is, and always has been, an important part of our everyday lives. From task lighting to atmosphere creation, lighting adds an element that is essential to our lives.