Lighting is the use of light to achieve a practical and aesthetic effect. Lighting includes the use of both artificial light sources, like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants. Lighting can be a form of decorative art and can be used in a variety of ways, from highlighting an area to creating a mood. Modern lighting technology enables to use sophisticated and varied forms of lighting. Specialized light fixtures can be used to enhance architectural features of a building or landscape, or to emphasise artwork and sculptures. Lighting design is an interdisciplinary field that applies knowledge of architecture, product design, interior design and electrical engineering. In buildings, lamps and/or light fixtures are chosen for their capability to emit sufficient light of an appropriate color temperature and color rendering index. When light fixtures that emit visible and/or ultraviolet (UV) light are installed in rooms, various actions must be taken for guaranteeing a safe environment for occupants. Electricity wiring must be protected by appropriate safeguards or insulators and electrician must be careful with the installation procedures to avoid the risk of electric shock or starting a fire. Over-lighting a room can cause glare and has a negative impact on visual comfort. Ultraviolet radiation can induce photochemical reactions on surrounding surfaces, causing permanent damage, such as fading of fabrics and artwork. Ultimately, proper lighting can have a major effect on the way in which an interior space is experienced. Good lighting can be used to emphasize textures and shapes, bring warmth and comfort, or be used to create a specific atmosphere. A beautiful lighting installation can be a fundamental part of any interior space.