Well I wasn’t attempting to prove lights deter crime. All I said was that it
was the original reason they installed them and apparently someone still
believes it helps. Someone asked for data so I posted a link.
Sent from my iPhone
> On Jan 8, 2018, at 1:03 AM, Lee Hart via EV <email@example.com> wrote:
> paul dove via EV wrote:
> That's a good start. But the studies it references assume the lights are on
> continuously, all night.
> It's not obvious what effect lights that detect people and turn off when
> there is no one around would have. They have to experiment, and collect data.
> But one thing to watch out for: General Electric wanted to sell more light
> bulbs to factories. So they did a study. They looked at the historical
> productivity and accident rates in a plant. Then they installed new, brighter
> lighting, and carefully measured productivity again. Voila! Productivity and
> safety improved!
> But... Then they repeated the experiment, but this time they *reduced* the
> amount of light (to save electricity or cost). Again, the historical
> productivity and accident rates improved!
> It turned out that the workers *knew* they were being watched and measured;
> so they worked harder and were more careful. The improvements came from the
> increases monitoring, not from the lighting changes.
> Crime statistics are likely to suffer from the same sort of bias.
> For example, adding lights to 1st street might lower the crime rate on 1st
> street... because the criminals moved to 2nd street. But adding lights to 2nd
> street (and eventually, to every street) may turn out to have *no* overall
> effect on crime, since everywhere is still the same.
> Whether we or our politicians know it or not, Nature is party to all
> our deals and decisions, and she has more votes, a longer memory,
> and a sterner sense of justice than we do. -- Wendell Berry
> Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)