Lux Illuminance Chart | Light levels in Indoor,Outdoor
This page mentions lux or illuminance chart. It mentions recommended light levels in indoor and outdoor with lux or illuminance values including natural sources.
As we know light level is known as illuminance. It is basically amount of light measured on plane surface. It can be total luminous flux incident on a surface per unit area.
It can be measured in foot candles (ftcd, fc, fcd) or lux (in SI units).
Following are the equations used to express relationship between various
units of measurement used for illuminance.
➤1 Lux = 1 Lumen/meter2
➤1 foot candle (ftcd, fcd) = 1 lumen/sq. ft = 10.752 lux
➤1 lux = 1 lumen/sq. meter = 0.0001 phot = 0.0929 foot candle
➤1 phot = 1 lumen/sq. cm = 10000 lumens/sq. cm = 10000 lux
Chart of Light levels from natural sources (Lux or Illuminance)
Natural source | Illumination (ftcd) | Illumination (lux) |
---|---|---|
Sunlight | 10000 | 107527 |
Full Daylight | 1000 | 10752 |
Overcast Day | 100 | 1075 |
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 |
Following chart mentions recommended light levels for different workspaces.
Chart of Light levels in Indoors
Light levels indoors | Illumination (Lux, Lumen/sq.m ) |
---|---|
Public areas with dark surroundings | 20 to 50 |
Warehouses, Homes, Theaters | 150 |
Easy Office Work, CLasses | 250 |
Normal office work, PC work, Study library, Groceries, Labs, Show rooms | 500 |
Super markets | 750 |
Mechanical workshops, normal drawing work | 1000 |
Detailed drawing work | 1500 to 2000 |
Visual tasks with low contrast & very small size for prolonged periods of time | 2000 to 5000 |
Training rooms | 500 |
Auditoria | 150 to 200 |
Child care centers, Parking , entrances, physical fitness space | 500 |
Chart of Light levels in Outdoors
Following table depicts recommendations for light levels for roadways and sidewalks in lux (or fc) units.

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