At home and at work, good lighting helps us see things clearly and avoid accidents. Street lights and automobile lights help us travel safely. Signal lights guide motorists, airplane pilots, railroad engineers, and ship captains. Companies and stores use lighted signs to identify themselves and to advertise their products. In addition, lighting adds beauty to homes and other buildings and to parks.
Good lighting helps the eyes work easily.
Reading or working in poor light cannot damage the eyes. But it may cause fatigue or eyestrain and lead to dizziness, headaches, or sleepiness. Regardless of where lighting is used, people depend on it for general seeing and safety, for specific activities, and for decoration. In the home, electric lamps and lighting fixtures provide light and safety for people walking from room to room or up and down stairs. Every room and passageway needs at least some general lighting so that things can be seen clearly enough to avoid accidents.