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Recommended Light Levels
published date:2019年09月20日??????Hits:174

Recommended Light Levels
Common Light Levels Outdoor
Common light levels outdoor at day and night can be found in the table below:

Condition

Illumination

(ftcd)

(lux)

Sunlight

10,000

107,527

Full Daylight

1,000

10,752

Overcast Day

100

1,075

Very Dark Day

10

107

Twilight

1

10.8

Deep Twilight

0.1

1.08

Full Moon

0.01

0.108

Quarter Moon

0.001

0.0108

Starlight

0.0001

0.0011

Overcast Night

0.00001

0.0001

Common and Recommended Light Levels Indoor
The outdoor light level is approximately 10,000 lux on a clear day. In the building, in the area closest to windows, the light level may be reduced to approximately 1,000 lux. In the middle area its may be as low as 25 - 50 lux. Additional lighting equipment is often necessary to compensate the low levels.
Earlier it was common with light levels in the range 100 - 300 lux for normal activities. Today the light level is more common in the range500 - 1000 lux - depending on activity. For precision and detailed works, the light level may even approach 1500 - 2000 lux.
The table below is a guidance for recommended light level in different work spaces:

Activity

Illumination

(lux, lumen/m2)

Public areas with dark surroundings

20 - 50

Simple orientation for short visits

50 - 100

Working areas where visual tasks are only occasionally performed

100 - 150

Warehouses, Homes, Theaters, Archives

150

Easy Office Work, Classes

250

Normal Office Work, PC Work, Study Library, Groceries, Show Rooms, Laboratories

500

Supermarkets, Mechanical Workshops, Office Landscapes

750

Normal Drawing Work, Detailed Mechanical Workshops, Operation Theatres

1,000

Detailed Drawing Work, Very Detailed Mechanical Works

1500 - 2000

Performance of visual tasks of low contrast  and very small size for prolonged periods of time

2000 - 5000

Performance of very prolonged and exacting visual tasks

5000 - 10000

Performance of very special visual tasks of extremely low contrast and small size

10000 - 20000


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