CAVITE NATIONAL SCIENCE HIGH SCHOOL
Using a Digital Camera
to Measure Light Pollution
of Towns in Cavite
Price Brix Rexson Q. Bernal
Light pollution, also known as photopollution or luminous pollution, is excessive or obtrusive artificial light. * The International Dark-Sky Association (IDA) defines light pollution as:
Any adverse effect of artificial light including sky glow, glare, light trespass, light clutter, decreased visibility at night, and energy waste. * Scientific definitions include the following:
Degradation of photic habitat by artificial light.
Alteration of natural light levels in the outdoor environment owing to artificial light source. *
Light pollution is the alteration of light levels in the outdoor environment (from those present naturally) due to man-made sources of light. Indoor light pollution is such alteration of light levels in the indoor environment due to sources of light, which compromises human health. *
Light pollution is the introduction by humans, directly or indirectly, of artificial light into the environment. * Light pollution can be divided into two main types:
annoying light that intrudes on an otherwise natural or low-light setting *
excessive light (generally indoors) that leads to discomfort and adverse health effects Types of Light Pollution
* Light trespass
Light trespass occurs when unwanted light enters one's property, for instance, by shining over a neighbour's fence. A common light trespass problem occurs when a strong light enters the window of one's home from the outside, causing problems such as sleep deprivation or the blocking of an evening view.
Over-illumination is the excessive use of light. Specifically within the United States, over-illumination is responsible for approximately two million barrels of oil per day in energy wasted. * Glare
* 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 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. * Light clutter
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. Clutter is particularly noticeable on roads where the street lights are badly designed, or where brightly lit advertising surrounds the roadways. * Skyglow
Skyglow refers to the glow effect that can be seen over populated areas. It is the combination of all light reflected from what it has illuminated escaping up into the sky and from all of the badly directed light in that area that also escapes into the sky, being scattered (redirected) by the atmosphere back toward the ground.
Background of the Study
Amateur astronomer and stargazer around the world is being alarmed of this recent phenomenon called Light Pollution.
At the same time, International Dark-Sky Association (IDA), a U.S.-based non-profit organization incorporated in 1988 by founders Dr. David Crawford, a professional astronomer, and Dr. Timothy Hunter, a medical doctor/amateur astronomer, preserves and protects the nighttime environment and our heritage of dark skies through quality outdoor lighting
Statement of the Problem
Will there be a big difference in the measurement of light pollution in different places in Cavite? *
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