The document discusses light pollution, defining it as excessive, misdirected, and obtrusive artificial light. It categorizes light pollution into types such as glare, skyglow, light trespass, and overlighting, and outlines the causes, effects on health, energy, and the environment, as well as potential solutions to mitigate it. The conclusion emphasizes the need for individual action to reduce light pollution and its negative impacts.

1. Light PollutionName: Nguyen Manh The, Duong Van Hoan, Nguyen Ba Hung
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2. Outline
Light
Pollution
Definition and Types of
Causes of
Effects of
Solution of 2

3. What is Light
Pollution ?
Excessive
Misdirected
Obtrusive artificial
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4. Types of light pollution
Glare Sky Glow Light Trespass Overlighting
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5. Glare
Too much
background light
tat reduces
visibility
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6. Car glare
Hate that
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7. Sky Glow
Upward directed
light reflects on
particles in the
sky reducing
visibility of stars
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8. North Vietnam
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9. 9

10. Light
Trespass
Light spills into an
area where it is
unneeded
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11. Overlighting
The excessive
use of light
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12. Causes of light pollution
40%
28%
32%
Light pollution caused by three sources
Street and Vehicle light
Advertising light
Industrial light

13. Street &
Vehicle Light
Rising the coverage of
light pollution

14. Advertising
Lights
Making the resonance
of light intensity

15. Industrial
Lights
Rising level of light
pollution

16. Effects of light pollution
Energy and Environment
People’s health
Plants and Animals
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17. Energy and Environment
12% of total
electrical energy
 Illuminating over 11 millions homes
 Powering over 777 thousands cars
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18. Energy and Environment
12M tons of CO2
702 millions trees to absorb the
CO2 produced by wasted light.
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19. People’s
Health Symptom
• Sleep deprivation
• Upsetting biological clock
Mental
• Anxiety
• Depression
Diseases
• Obesity
• Diabetes
• Cancer
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20. Plants and Animals
DARKNESS AS IMPORTANT AS LIGHT
Plants
•Photosynthesis in the
light.
•Breathing in the
darkness
Animals
•Feeding
•Mating
•Migration cycles
•Losing orientation of
time
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21. Solution
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22. Low wattage
bulbs
More Energy lose
More Light pollution
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23. Warm It Up
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Cool LED lights
emit a blue
short
wavelength
light that
scatters easily
into the
atmosphere
Eye strain
Impairs night vision
Adds to light pollution

24. Sense It
Light bulb
Sensor
Smart bulbs
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Motion
Sensor
Light
Sensor

25. Cut it off
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• Prevents light from escaping
above the horizontal plane
• Minimize up lighting
• Reduce high-angle brightness

26. Non-cutoff Semi-cutoff Cutoff Full-Cutoff26

27. Turn Off
Reduce
Energy
Reduce light
pollution
Save your
money
Protect
environment
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28. 28

29. Be Involved
Home
Work
Community
Close the blinds and curtains
Turn off or dim office lights after all workers
Dim after-hour signs to prevent glare and light
clutter.
Propose lighting ordinances to your local and
governments 29

30. Sumarize
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Definition
•Excessive
•Misdirected
•Obtrusive
artificial
Kinds
•Glare
•Sky glow
•Light trespass
•Over lighting
Cause
•Traffic lights
•Advertising
lights
•Industrial lights
Effect
•Wasting
energy
•Damaging
environment
•Posing
negative
effects on
people’s
health
•Degenerating
plants and
animals
Solution
•Low voltage
•Warm lights
•Sense It
•Cut it off
•Turn off
•Be Involved

31. Conclusion
Light pollution is dark side of light
It’s time to use your power to change your life
Start by reducing light pollution
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32. References
 http://www.delmarfans.com/educate/basics/lighting-pollution/?
 http://physics.fau.edu/observatory/lightpol-prevent.html
 http://www.blue-marble.de/nightlights/2012
 http://darksky.org/light-pollution/
 http://www.lightpollutionmap.info/#zoom=8&lat=2365750.1965&lon=1
1806585.38032&layers=0BTFFFFTT
 http://www.globeatnight.org/light-pollution.php
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33. Thanks for listening
Time for question33