Lighting, or illumination, is the deliberate use of light to achieve a practical or 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, and 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. In the workplace, the primary function of lighting is to ensure a safe and comfortable work environment for people. Proper lighting can improve people's ability to do tasks without eye strain, and enable them to see things better. However, depending on the job, people may require different lighting conditions in order to perform properly and safely. For example, assembly line workers may need bright, uniform lighting in order to accurately identify parts and perform the task properly. The same would apply for painting, plumbing or any other highly detailed job. Gardening, however, may require diffuse, low-level lighting since too bright a light can damage delicate plants. The amount of light required for a particular space or activity depends on several factors, including the level of activity, the age and health of the occupants, and the type of work being done. Careful attention needs to be given to the type of lighting used in a particular space in order to provide the best possible conditions for both working and living.