FLOODLIGHTS

Streetlighting systems usually give lighting intensity from .01 to 0.5 footcandle; however, this value is too low for any night activity requiring

Figure 1-18.\Roadway perspective view.

Table 1-3.\Recommended Intensities for Specific Night Activities

good visibility. Table 1-3 gives recommended illumination intensities for specific night activities. The following suggestions should be followed to improve the efficiency of floodlighting systems:

Select floodlight locations so beams strike the surface to be illuminated as nearly perpendicular as possible.

When lighting irregular surfaces, use two or more floodlights to reduce sharp shadows caused by surface contour.

For lighting extended horizontal surfaces, such as work areas, mount floodlights high enough to minimize glare.

For lighting extended vertical surfaces, such as smoke stacks or towers, mount floodlights so distance between floodlights or groups does not exceed twice the distance from the floodlight to the illuminated surface.

Use a smaller number of large floodlights instead of a larger number of smaller floodlights.