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Orders of magnitude (illuminance)

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Title: Orders of magnitude (illuminance)  
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Subject: Orders of magnitude (luminance), Orders of magnitude (resistance), Macroscopic scale, Quantum realm, Names of small numbers
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Orders of magnitude (illuminance)

To help compare different orders of magnitude, the following list describes various source of lux, which is measured in lumens per square metre.

Multiple Value Item
0 0 lux 0 lux Pitch-black
10−4 100 microlux 100 microlux Starlight overcast moonless night sky[1]
140 microlux Venus at brightest[1]
200 microlux Starlight clear moonless night sky excluding airglow[1]
10−3 1 millilux 2 millilux Starlight clear moonless night sky including airglow[1]
10−2 1 centilux 1 centilux Quarter Moon
10−1 1 decilux 2.5 decilux Full Moon on a clear night[1][2]
100 1 lux <1 lux Extreme of darkest storm clouds, sunset/rise
<1 lux Moonlight[3]
101 10 lux 40 lux Fully overcast, sunset/sunrise
102 1 hectolux <200 lux Extreme of darkest storm clouds, midday
400 lux Sunrise or sunset on a clear day (ambient illumination).
104 10 kilolux 10 - 25 kilolux Typical overcast day, midday
20 kilolux Shade illuminated by entire clear blue sky, midday
105 100 kilolux 110 kilolux Bright sunlight
120 kilolux Brightest sunlight

See also


  1. ^ a b c d e Paul Schlyter, Radiometry and photometry in astronomy FAQ (2006)
  2. ^
  3. ^
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