Light pollution or photo pollution is presence of artificial light during night. It is excessive, misdirected and obtrusive uses of light altering natural condition. It causes destruction of photic habitat by artificial light.  Light pollution interferes with astronomical observations and like any other form of pollution disrupts ecosystem and has adverse effect on human health. Over-illumination or improper spectral composition of light may include increased headache, fatigue, stress and decreased sexual desire. Light pollution is side effect of urbanization, the source of light includes interior and exterior lighting, advertisement boards, office, home and streetlights. The aspect can be view from eye of energy conservation also, the unnecessary lighting habits creates energy misuse. Since everybody is not irritated by same intensity of light source, light pollution is a relative term. It posses' severe threat to nocturnal wildlife also affecting normal physiology of trees. it can create confusion for animal navigation and cause physiological alteration.