Illuminance Categories and Illuminance Values for
Generic Types of Activities in interiors As per
IESNA
|
|
Type of Activity
|
Illuminance
Category
|
Ranges of Illuminance
|
Reference work plane
|
|
Lux
|
Foot-candles
|
|
Public spaces with dark surroundings
|
A
|
20-30-50
|
2/3/05
|
General
Lighting Throughout spaces
|
|
Simple orientation for short temporary
visits
|
B
|
50-75-100
|
5-7.5-10
|
|
Working spaces where visual tasks are only
occasionally performed
|
C
|
100-150-200
|
10/15/20
|
|
Performance of visual tasks of high
contrast or large size
|
D
|
200-300-500
|
20-30-50
|
Illuminance on
task
|
|
Performance of visual tasks of medium contrast or
small size
|
E
|
500-750-1000
|
50-75-100
|
|
Performance of visual tasks of low contrast or very
small size
|
F
|
1000-1500-2000
|
100-150-200
|
|
Performance of visual
tasks of low contrast and very small size over a prolonged period
|
G
|
2000-3000-5000
|
200-300-500
|
Illuminance on
task obtained by a combination of general and local (supplementary lighting)
|
|
Performance of very prolonged and exacting visual task
|
H
|
5000-7500-10000
|
500-750-1000
|
|
Performance of very special visual tasks of extremely
low contrast and small size
|
I
|
10000-15000-20000
|
1000-1500-2000
|
