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: >> https://www.crimesolutions.gov/PracticeDetails.aspx?ID=38 > > 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 > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)