Outdoor Lighting and Crime - Amper

TABLE 11. Drugs Crime and Light at Night along Melbourne Streets
Quantity Bourke Street
Range of Illuminance at
Arrest Locations,
and Number of Locations
Mean and Standard
Deviation of Illuminance at
Arrest Locations
Difference of Means: Crime
Illuminance – Street
Illuminance
17.2 to 147 lux
19
76.71 lux
51.97 lux
Russell Street
48 to 153 lux
13
77.73 lux
37.21 lux
-6.819 lux 35.24 lux
F 4.866, p < 0.01; 69, 18 df 1.139, ns
t 0.374, 70 df, ns* 3.149, p < 0.01, 61 df
Mean and Standard
Deviation of Log10
Illuminance at Arrest
Locations
Difference of Means: Arrest
Log10 Illuminance – Street
Log10 Illuminance
1.7926
0.2936
1.8505
0.1872
0.0948 0.3819
F 1.952, ns 4.627, p < 0.01; 49, 12 df
t 1.039, ns 4.839, p < 0.001, 45 df*
The F and t values are for comparisons of the variances and means of the distributions of
pooled illuminances in Table 10 with the corresponding quantities in this table: ns is not
significant, p is probability, and df is degrees of freedom.
* Using the method appropriate for significantly different variances (Hays 1970, pp
317, 322)
5.6.3 Proliferation of floodlighting
A further indication of the extent to which proliferation of outdoor lighting is out of control is
the almost inevitable installation of low-mounted security floodlights around every new
industrial building in the suburbs of Melbourne. Outdoor storage areas likewise tend to be
brightly floodlit all night. Outdoor used car yards might more accurately be described as
brilliantly floodlit, generally by means of metal halide lamps in simple sheet-metal reflectors
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