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light pollution

Garry

Wt does light pollution mean?


No.01

Light pollution is brightening of the night sky caused by street lights and other man-made sources, which has a disruptive effect on natural cycles and inhibits the observation of stars and planets.

What causes light pollution?


No.02

Light pollution is caused by inefficient or unnecessary use of artificial light. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow. For example, some buildings are made of glass. When sunlight reflects on glass, it will cause light pollution.

What are the effects of light pollution?


No.03

Light pollution, or artificial light at night, is the excessive or poor use of artificial outdoor light, and it disrupts the natural patterns of wildlife, contributes to the increase in carbon dioxide (CO2) in the atmosphere, disrupts human sleep, and obscures the stars in the night sky.

How can we reduce light pollution?


No.04

We can use dimmers, motion sensors and timers to help to reduce average illumination levels and save even more energy. Switching to LED lighting allows for reduced illuminance without compromising visibility. Turn off unnecessary indoor lighting – particularly in empty office buildings at night.

World light pollution


No.05

The micronation of Singapore in southeastern Asia has the most light pollution, a reflection of its extreme population density at about 8000 people per square kilometer, and Singapore has the most light pollution.

4 types of light pollution


No.06

Light pollution is caused by inefficient or unnecessary use of artificial light. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow.


a: Light trespass occurs when unwanted light enters one's property, for instance, by shining over a neighbor's fence.


b: Over-illumination is the excessive use of light. In the USA commercial building lighting consumes in excess of 81.68 terawatts (1999 data) of electricity, according to the DOE. Even among developed countries there are large differences in patterns of light use. American cities emit three to five times more light to space per capita compared to German cities.


c: Glare can be categorized into different types. One such classification is described in a book by Bob Mizon, coordinator for the British Astronomical Association's Campaign for Dark Skies, as follows: Blinding glare describes effects such as that caused by staring into the Sun. It is completely blinding and leaves temporary or permanent vision deficiencies. Disability glare describes effects such as being blinded by oncoming car lights, or light scattering in fog or in the eye, reducing contrast, as well as reflections from print and other dark areas that render them bright, with a significant reduction in sight capabilities. Discomfort glare does not typically cause a dangerous situation in itself, though it is annoying and irritating at best. It can potentially cause fatigue if experienced over extended periods.


d: Light clutter refers to excessive groupings of lights. Groupings of lights may generate confusion, distract from obstacles (including those that they may be intended to illuminate), and potentially cause accidents.



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