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.
Refer Lux vs Lumens >>, LED test equipments >> and Lux Light Meter >> used for testing lighting devices.
Advantages and Disadvantages of other equipments, meters or devices
What is difference between or comparison between
Following links mention difference or comparison between various equipments and terms:
comparison between SPI and I2C
difference between PXI and PCI
Microscope vs Telescope
Amplitude Modulation vs Angle Modulation
difference between modem and router
Air Fuel Ratio Sensor vs O2 Sensor
Radiometer vs Spectrometer vs Spectroradiometer
Clamp meter vs digital multimeter
Colorimeter vs Spectrophotometer
difference between Prism and Grating
difference between Venturi meter and Orifice meter
difference between Lux and Lumens