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.

Factor
[Lux]
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 luxMoonlight[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

References

  1. 1 2 3 4 5 Paul Schlyter, Radiometry and photometry in astronomy FAQ (2006)
  2. "Petzl reference system for lighting performance". Archived from the original on 2008-06-20. Retrieved 2007-04-24.
  3. Bunning, Erwin; Moser, Ilse (April 1969). "Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction" ( Scholar search). Proceedings of the National Academy of Sciences of the United States of America. 62 (4): 1018–1022. Bibcode:1969PNAS...62.1018B. doi:10.1073/pnas.62.4.1018. PMC 223607Freely accessible. PMID 16591742. Retrieved 2006-11-10.
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