Light allows us to perceive our surroundings using our eyes. Light is not only used for sight but also has an influence on endogenous messenger substances and sets the "body clock". If the irradiance exceeds certain levels, light can also be harmful – especially to the eyes.

Warm lighting provides comfort and relaxation, fostering social connections and positive emotions, while cool lighting enhances alertness and concentration.

The modern-day light bulb not only revolutionized home and work life, it also influenced urban development and accelerated the economy. Many people migrated from rural areas to the city in search for work. Late-night restaurants, businesses, and sporting events provided new employment opportunities and entertainment.