Lighting, also known as 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 natural illumination of interiors from daylight. Daylighting is a method of illuminating a space through strategically placed windows and architectural elements. Lighting enhances visual perception of human activities and beauty. Lighting is one of the most important components in interior design and can affect everything from the overall ambience of a space to the productivity of those who occupy it. The type and location of lighting fixtures, as well as the colour temperature, play a role in how people experience a space. Proper lighting can be used to create a sense of calm, relaxation, and comfort or help to increase concentration. Proper lighting can also serve a practical purpose. In places where people may need to see clearly for safety reasons such as stairwells, hallways, and parking garages, the appropriate amount of light provided by well-designed lighting can have an important influence on our ability to move and see without incident. Additionally, lighting can be used to calculate cost savings in commercial spaces by being connected to occupancy sensors that can dim or turn lights off when areas are unoccupied. In order to achieve the best illumination effects, it is important to consider the technical aspects of lighting such as the definition of levels. Levels are measured in terms of foot-candles (lux) and can determine how much energy is used to light a space and how much space is illuminated. Additionally, the colour temperature of lighting and its CRI (colour rendering index) should be taken into account when selecting lighting for a space. Overall, lighting is an important contributor to the overall design of a space, influencing the mood, ambience, productivity, and safety factors of the occupants. With the right combination of design, technical, and aesthetic elements, the perfect lighting environment can be achieved to create the most effective and pleasant atmosphere.