Lighting is an essential aspect of the built environment. It not only illuminates the interior and exterior spaces of buildings, but also creates a pleasant ambience where people can work and live. Lighting has a variety of applications, from functional lighting that allows people to see clearly and move safely within a space, to decorative lighting that adds beauty and elegance to a room. The purpose of the lighting should be considered when choosing and installing the product. The type of lighting used will depend on the needs of the people using the space. Task lighting is used to make specific tasks easier to complete, while ambient lighting sets a mood and helps to create a comfortable environment. Decorative lighting may also be used to add visual interest to the space. The colour temperature of a light source is an important consideration when choosing lighting, as it affects the brightness and warmth of the light. Generally, warm lighting is best for residential settings, while cooler lighting may be more suitable for commercial spaces. It is also important to consider the wattage, as higher wattages may be too bright in some settings. When selecting lighting products, it is important to consider energy efficiency. LED lighting is becoming increasingly popular, as it is energy efficient and has a long lifespan. It is also important to consider light pollution from outdoor lighting, as it can cause unnecessary illumination of the night sky. In conclusion, lighting is a key element in the built environment. It is important to consider the purpose of the lighting, the type of lighting needed, the colour temperature and wattage, and the energy efficiency of the product when selecting lighting.