Light pollution is a new type of pollution caused by streetlight, lightening signs, and all other lights we use in our everyday lives. Light pollution may cause a lot of damage to people and all living things. For example, too much light can disturb the ecosystem, decrease the amount of harvest, and streetlight may pass through windows of houses and cause sleep disorder. Also, most of the lights in parks and gardens will shine the ground, while some of it may be discharged into the sky, which may lead to wasting energy. There has also been a research showing that being exposed to excessive light at might may pull down your rhythm of ecology, and that if we stop light from leaking, we can save 37.5% of building light, and 45.6% of streetlight.

The number of damage cases caused by light pollution is increasing at a fast rate in Korea. Korea reported that light pollution had been one of the 5 major environment problems. In 2015, for the first time, the harm on crops caused by light pollution was proved and acknowledge. A farmer claimed that because of the night lightening from the railroad, 85% of his yields from Perilla seeds and 19% from his beans had decreased. The court made a decision that the railroad company must pay for the damage, and this became the precedent of compensation from light pollution.

As light pollution is becoming an environmental problem, LED is rising as a countermeasure. It is said that using LED may decrease light pollution and because it is more effective in saving energy LED will be able to help solve this problem.