Specifications

Floodlights
21
Common Pole Layouts
Ground Areas
The more lighting locations used, the better the quality of lighting with respect to
uniformity, visibility and reduction of shadows. Pole spacings, a factor of the mounting
height are recommended maximums. The minimum number of floodlights required at
each location for adequate beam coverage is one for corner locations, two for side
locations and four for center locations.
Vertical Areas
A standard layout for vertical areas using wide-angle floodlights is shown in Fig. A.
The floodlight setback distance D should be at least one-quarter the height.
Spacing between units should not exceed twice D.
Target Average Target Finish
Surface Description Illuminance
Bright . . . . . . .Light Surfaces . . . . . . . . .5 fc
Bright . . . . . . .Medium Light Surfaces . . .7 fc
Bright . . . . . . .Dark Surfaces . . . . . . . . . .10 fc
Dark . . . . . . . .Light Surfaces . . . . . . . . .2 fc
Dark . . . . . . . .Medium Light Surfaces . . .3 fc
Dark . . . . . . .Medium Dark Surfaces . . .4 fc
Dark . . . . . . . .Dark Surfaces . . . . . . . . . .5 fc
Surface Illumination
Recommendations
Effective floodlighting design is a
complex and subjective task. Results
are heavily dependent upon
surrounding light levels, surface finish
of the intended target, spectral color
distribution of the lamp source,
mounting location allowances, and
viewer’s perceptions. The table on right
lists IESNA (Illuminating Engineering
Society of North America) recommended
illuminance levels for the floodlighting
of buildings and monuments.
4H
2H
2H
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




2H
2H
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








2H
2H
2H
2H

2H
4H
4H
2H
NARROW AREA


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


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
4H

4H
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

2H

2H
2H
4H
2H
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



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

4D
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D
D2D 2D 2DD
VERTICAL AREA
SUCH AS
BUILDING OR SIGN
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  
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Fig. A
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