Lighting is a major part of our lives and is especially important for environments in which we work, live, or play. Lighting can make the difference between a safe, secure environment and one which is insecure and potentially hazardous. Good lighting is energy-efficient lighting, as it reduces the cost of operation and maintenance, as well as being more energy-efficient and environmentally friendly. Good lighting also helps to improve the quality of life and increases the productivity of people using a space. Lighting should be considered as an investment, not just an expense, as it can reduce costs over the long term. Lighting is not only about the choice of luminaires, but also the selection and placement of fixtures, the installation of appropriate controls and the setting of a desirable illumination level in each space. Certain types of lighting are well designed to reduce glare while improving visibility. Most importantly, lighting should be considered a part of an overall approach to a healthy, safe and productive environment. With an effective lighting system, businesses, schools, hospitals and other workplaces can drastically improve the comfort, security and productivity of their staff and patrons. Good lighting also enhances safety in the environment, helps to reduce energy costs, and works towards a more sustainable environment.