Wednesday, July 25, 2007

Astronomy communities



The media has globbed onto the existence of planned astronomical communities where bad lighting design is not allowed by rules and housing covenants. These are new places, places only needed in the recent past, because of the horrendous growth of light pollution. Continued light pollution increases of 5-10% per year mean the end of the visibility of the stars in just a few decades. Already 2/3rds of Americans haven't seen the Milky Way. By 2025 there will simply be no more dark sky in the United States. Simply no place. Current arguments about "why don't you move your scopes to a dark place" are ignorant by this measure and besides, are the people who created the light pollution paying for relocation? Destruction of useful observatories like Mt. Wilson and the current degradation of Palomar by misinformed politicians who'd rather be concerned about aesthetics than efficiency and science:

(Mayor Dick Murphy) said he also supports the change for aesthetic reasons: "People think they're ugly."

Astronomers also are concerned about a plan before the council to replace some hooded streetlights with decorative acorn-shaped lamps in various historic districts. The acorn lamps allow most of their light to shine upward, to the sky.

"They are blantantly inefficient," said Paul B. Etzel, director of the nearby Mount Laguna Observatory. "It's a 19th century solution to a 21st century problem."

Critics also point to higher costs. Getting rid of the low-sodium lights would cost nearly $2.8 million and raise the city's power bill by a half-million dollars a year, according to a city report.



This alley has 4 250W lights plus a 150W streetlight within a thirty foot radius. A resident of this building can't get the city to remove or shield any of the lights.

Which constellation lost will make people realize the sky is gone? Orion? The asterism of the Big Dipper? Already seeing the Pleiades is tough in Chicago, and the faintest star of the Big Dipper is getting difficult to see.

I've seen it first hand in a place that doesn't need anymore light, yet we in Chicago increase the energy use in lighting by leaps and bounds whenever the mayor needs re-election or a University president feels to rule by fiat. I can only hope people will eventually realize spending tens of thousands of dollars for just the light that goes up into the sky (yes, really) is not smart for a campus nor the millions of dollars per year for a city like Chicago. The nation as a whole wastes--not uses, but wastes--$5 billion a year or more in outdoor lighting that doesn't hit its target.


Would you want to live with this light outside your bedroom, giving you breast cancer?

People think that brighter lighting decrease crime--but it doesn't, period, and in fact, I was shocked to discover someone actually checked: Brighter alley lights in Chicago increased crime in the alleys by 21% percent: Each of the three crime categories experienced an increase in the number of
reported incidents between the pre and post- installation period. Violent Index offenses
increased 14 percent (119 to 136), property Index offenses increased 20 percent (30 to
36) and non-Index offenses increased 24 percent (279 to 347). All this, using 160W more per fixture (there's 175,000 of them in the city), adding 28 Megawatts to the "Greenest" city.

2 comments:

David Oesper said...

Thanks, Dean. I'd like to invite you and others to join the DarkSkyCommunities Yahoo! group
where we discuss astronomy-friendly communities. My vision is to help create dark-sky communities that are affordable, and sustainable. Where resources are shared, and educational outreach and research a crucial part of what the community does. Where anyone with an interest can live, not just those who can afford second homes and private observatories.

David Oesper
Dodgeville, Wisconsin

Christian said...

Mr. Armstrong:

Your argument that brighter Chicago street lights led to an increase in crime is misleading. The study you cite only covered a small part of the city and recorded a similar increase in crime in the control area -- an area of Chicago of similar demographics where lighting remained unchanged. So, there may be alternate causes at work. Furthermore, the study records an increase in reported crimes. This means that lighting may have actually increased detection of crime, and not crime itself.

Also, your insinuation that street lights cause breast cancer grabs our attention, but insults our intelligence. The article you cite says that exposure to artificial light at night may stimulate tumor growth, but it never says that one kind of night light is more dangerous than another. So, the streetlight outside my sister's window might pose the same risk as the lamp on her desk or the lighting in her office. And seriously, she can always just close the blinds.

At least you are honest enough to cite your sources. I commend you for that.