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2005_0711_Packet
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2005_0711_Packet
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Roseville City Council
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Information Si�eet 139 (July 1998) <br />D?198 <br />Page 1 of 4 <br />International Dark Sky Association -- Information Sheet �39 <br />Why Shoufd a City Government Be Concerned <br />About Light Pol�ution? <br />The public's loss of �he stars from �he nighttime sky is a real tragedy that eve�y <br />city gavernment s�ould be aware of and not allow. This loss is a testament to our <br />myopia and to our growing insulation from the natural world. Like the canary in <br />the mineshafts of old, astronomers are warning us of the unnecessary loss of a <br />dark n�ghttime sky in almost every urban area. Their warnings point to the <br />probiem as well as revea�ing a missed opportuni�y. <br />We have only b�en pitch�ng our tents for a little while in the land of power <br />stations and industry, so it is no surprise that we are somet�mes blinded by its <br />promise. Part of the advance of ou�c technological society has been a steady if <br />sometimes intermittent advance in �he efficient uses of ene�rgy. However, when <br />energy appears cheap, w� tend to waste energy rather than use less of i�. <br />Light pollution represents a waste of a magnitude that almost no hoameowner <br />would allow inside their homes. Interior ligh�s bounce off of a�l the room's <br />suarfaces, providing for good general illum�na�ion. �nly small amoun�s of light <br />will escape out of the windows. How strange it is, then, that when we attempt to <br />light the outdoors, we often earelessly a1�ow a large percentage of light to escape <br />unused. <br />With our older outdoor lighting, we often see up �0 5�% or more of the �ight going <br />directly up inCo the sky or at such shallow angles that it is not useful. Like a driver <br />driving toward the light of the ,s�tting sun, such unshi�ided Iighting creates glare <br />and diminishes visibility. In engineering terms, this is known as a poor <br />"coeff cient of utilization". <br />4ur tole�rance of wasted light means most lighting fixtures are oversized by ai <br />least a third in watiage. Many light sources are of an older, less efficient type, <br />whieh means ihat oppoz-tunities ofien exist io significan�ly reduee energy <br />consumption by switching to a newer, more efficient �ype of light source in a <br />f xture with good cantrol of the light output and proper shielding. Using $10 a <br />year as the ave�age cost for ou�door ligh�ing per person, from $3 to $5 is being <br />http://www.darksky.org/in�oshts/is 139.�izn1 6/20/2005 <br />
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