Use
|
Task
|
Maintained Footcandles1
|
Uniformity Ratio2
(Maximum:Minimum)
| |
---|---|---|---|---|
Streets
|
Local residential
|
0.4 minimum
|
6:1
| |
Local commercial
|
0.9 minimum
|
6:1
| ||
Parking: Multifamily residential
|
Low vehicular/pedestrian activity
|
0.2 minimum
|
4:1
| |
Medium vehicular/pedestrian activity
|
0.6 minimum
|
4:1
| ||
Parking: industrial, commercial, institutional and municipal
|
High activity (e.g., regional shopping centers/fast food facilities,
major athletic/civic/cultural events)
|
0.9 minimum
|
4:1
| |
Medium activity (e.g., community shopping centers, office parks,
hospitals, commuter lots, cultural/civic/ recreational events)
|
0.6 minimum
|
4:1
| ||
Low activity (e.g., neighborhood shopping, industrial employee
parking, schools, church parking, farm businesses, farm operations)
|
0.2 minimum
|
4:1
| ||
Walkways and bikeways
|
0.5 minimum
|
5:1
| ||
Building entrances and signs
|
4.0 average
|
—
|
1
|
Illumination levels are maintained horizontal footcandles on
the task, e.g., pavement or area surface.
| |
2
|
Uniformity ratio is a measure of the dispersion of light on
an area. The ratio is measured as maximum light level to minimum light
level. Example: 4:1 for the given area, the maximum level of illumination
should be no less than four times the minimum level of illumination
(0.2 x 4 = 0.8 maximum light level).
|