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Light Level or Illuminance, is the amount of light measured in a plane. The work plane is where the most important tasks in the room or space are performed.
Measuring Units Light Level - Illuminance
Common Light Levels Outdoor
Illumenance is measured in foot candles (FC) or LUX ). A foot candle is actually one lumen of light density per square foot, one lux is one lumen per square meter.
Condition
Illumination
FC
LUX
Sunlight
10,000
107,527
Full Daylight
1,000
10,752.7
Overcast Day
100
1,075.3
Very Dark Day
10
107.53
Twilight
1
10.75
Deep Twilight
.1
1.08
Full Moon
.01
.108
Quarter Moon
.001
.0108
Starlight
.0001
.0011
Overcast Night
.00001
.0001
• LUX = FC (10.752)
• FC = LUX / 10.752
Common and Recommended Light Levels Indoor
The table below is a guidance for recommended light level in different work spaces. Remember that this is a Guideline. Personal Preference is always a consideration.
Activity
Illumination
FC
LUX
Warehouses, Homes, Theaters, Archives
13.95
150
Easy Office Work, Classes
23.25
250
Normal Office Work, PC Work, Study Library, Groceries, Show Rooms, Laboratories