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\begin{document}

\sffamily

\LARGE

\centering

\color{textgr}


\title
{%\vspace*{0.3\textheight}
\vspace*{\fill}
 \Huge
Light, safety and security}
\author{\color{white} \LARGE 
Jan Hollan, IDA Czech Section}
\date{\LARGE
Symposium for the Protection of the Night Sky, Bled, Oct 2007 \vspace*{\fill}
}

\maketitle

\sect{We are afraid of darkness...

as children, and even as adults, mostly}

\sect{We are less afraid if some more light is around}

\sect{The ghosts and monsters

are born from the darkness...}

\sect{We can't admit to believe that,

so we speak about bad guys instead... \\
about criminals.

\bigskip

\bigskip
But these, as humans, are afraid of darkness too.}

\sect{It's reasonable to light our path 

if we suspect there might be obstacles. To prevent injury. 

\bigskip

\bigskip
It's naive to believe that light will wipe out criminals 

like ghosts in fairy tales...}

\sect{Edison promoted his light bulb:

 \emph{it will reduce crime a lot...}

\bigskip

What happened  indeed?}

\sect{The same opinion: 
 
\emph{let's add light to reduce crime}

is still widespread and repeated by lighting business}

\sect{Why?

Lighting certainly decreases {\color{white} fear} of crime.

\bigskip

But what about {\color{white} crime} itself?}

\sect{Existing field trials of lighting for crime prevention are 
invalid

      because of systematic bias and reliance on non-independent data

      (Marchant 2004-2007).}


\sect{Significant positive correlations exist between

      city waste light and city crime rates. 

\bigskip
\bigskip
       
{\color{white}Lighting blackouts always result in reductions in crime,}

indicating the 
causal direction of the correlation. 
      
      (Clark 2002, 2003)}
 

\sect{{\color{white}The net effect of lighting is 

to assist more than to hinder 
criminal acts.}

\bigskip

\bigskip
Fortunately, the effect is not strong: 

few per cent increase in crime 
per increasing light amounts 10x.}


\sect{Still, to reduce crime, 

reducing light levels 

to not much more than moonlight would help.}

\sect{
\wwws{http://amper.ped.muni.cz/bajc}
}

 
\end{document}