What is light pollution?
Excessive, misdirected, or obtrusive (usually
outdoor) light.
Brightening of the night sky that inhibits the
observation of stars and planets, caused by
street lights and other man-made sources.
Various Night Skies
Good Light Sources
Good outdoor lighting should:
Optimize visibility at night for what we want lit
Minimize energy consumption
Minimize impact on the environment and ourselves
Minimize glare
Minimize light trespass
Identifying Light Pollution
Light that can be found rude, obstructive, or
oppressive by the non-owners of the light
Kinds of Light Pollution
3 main kinds
Glare- light from unshielded sources.
Light trespass (AKA spill light)- unwanted light that
enters one’s.
Skyglow- the combination of all the reflected light
and upward-directed (unshielded) light escaping
up into the sky (and for the most part, unused),
causing the glow effect that can be seen over
populated areas.
Kinds of Light Pollution
(con’t)
Other types of pollution
Uplight- wasted light that goes directly up into the
night sky, is "lost in space”, and serves no useful
purpose.
Clutter- bright, confusing, ugly and excessive
groupings of light sources, commonly found in
over-lit urban areas.
Various Lighting Techniques
Light Pollution Diagram
Glare
Glare
Glare
Light Trespass
Light Trespass
Ineffective Lighting
Improving Lighting Designs
Minimizing Light Pollution
Improving Street Light Design
Improving Energy Efficiency
General
More than half of the world’s population now
living in cities
3 out of every 4 people in cities have never
experienced pristinely dark skies
Maps of Light Pollution
http://www.lightpollutionmap.info/#zoom=4&lat=
5759860&lon=1619364&layers=B0TFFFTT
http://www.youcanseethemilkyway.com/lightpollution/
http://www.blue-marble.de/nightlights/2012
Light Pollution Increase (1950s-Projected 2025)
Squid Fisheries
The Effects of Light
Pollution
Light pollution wastes
Light pollution consumes
Light pollution pollutes
Light pollution harms
Light pollution threatens
Light pollution destroys
How Light Pollution Affects Animals
Affect on Circadian Rhythm
Turn Out the Lights
Ashy Storm Petrel
Sea Turtle Cartoon
Baby Turtles
http://www.tourdeturtles.org/flash/LightPollution.swf
What This Means For the
Future
Loss/endangerment of species
Health-related issues
Depletion of resources
How We Can Stop Light
Pollution
Shielding lights properly
Only using light when and where it is needed
Only using the amount that is needed
Making sure exterior lighting only light the ground
beneath them
Remember: need, intensity, duration, and spectrum
Resources
Articles
http://www.globeatnight.org/light-pollution.php
http://ngm.nationalgeographic.com/2008/11/lightpollution/klinkenborg-text
http://www.physics.fau.edu/observatory/lightpol.html
http://www.starrynightlights.com/lpIndex.html
http://www.actionbioscience.org/environment/longcore_ri
ch.html
Resources (con’t)
Images
http://wolvesonceroamed.files.wordpress.com/2012/03/nig
ht-sky.jpg
http://www.penny4nasa.org/wpcontent/uploads/2013/07/asc-csa.gc_.ca-efficientlighting.gif
http://www.nature.nps.gov/night/assets/images/outdoorlig
hts.jpg
http://www.physics.fau.edu/observatory/lightpolsecurity.html
Resources (con’t)
Images
https://m1.behance.net/rendition/modules/56652753/disp/
712f602803941d252f4f6122b3003654.jpg
http://a.static.trunity.net/files/141201_141300/141277/circ
adian_rhythm.jpg
http://physics.fau.edu/observatory/Images/parkinglot2_sm
.jpg
http://www.penny4nasa.org/wpcontent/uploads/2013/07/wired.com-light-pollution.jpg
Resources (con’t)
Images
http://old.nightwise.org/lot04608.JPG
http://old.nightwise.org/DSC07928.JPG
http://calgary.rasc.ca/lp/Images/s_full_cutoff_roadwa
y_lights_large.jpg
http://www.alternativesjournal.ca/sites/default/files/a
rticle/Light_Pollution_Diagram_680px.jpg
Resources (con’t)
Images
http://scienceblogs.com/startswithabang/files/2009/09/squ
id-fisheries.jpg
http://www.delmarfans.com/images/content/educate/Light
_Pollution_Article/Unshielded-Light-Waste-Large.jpg
http://bloximages.newyork1.vip.townnews.com/sustainabl
ecitynetwork.com/content/tncms/assets/v3/editorial/9/71/
97155ce4-3be9-11e1-a993001a4bcf6878/4f0cd500952f6.image.jpg
Resources (con’t)
Images
http://s15.photobucket.com/user/Chance2795/media/seat
urtlecartoon.jpg.html
http://www.mesa.edu.au/turtles/images/cut_the_glow.jpg
http://www.earthrangers.com/content/wildwire/protect_bir
ds_light_pollution.jpg
http://irregulartimes.com/wpcontent/uploads/2009/08/ashystormpetrellight.jpg