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 Absolute darkness
10−4 100 microlux 100 microluxStarlight overcast moonless night sky[1]
140 microluxVenus at brightest[1]
200 microluxStarlight clear moonless night sky excluding airglow[1]
10−31 millilux2 milliluxStarlight clear moonless night sky including airglow[1]
10−21 centilux1 centiluxQuarter Moon
10−11 decilux2.5 deciluxFull Moon on a clear night[1][2]
100 1 lux< 1 luxExtreme of darkest storm clouds, sunset or sunrise
< 1 luxMoonlight[3]
1011 decalux40 luxFully overcast, sunset or sunrise
102 1 hectolux< 200 luxExtreme of darkest storm clouds, midday
400 luxSunrise or sunset on a clear day (ambient illumination)
104 10 kilolux10–25 kiloluxTypical overcast day, midday
20 kiloluxShade illuminated by entire clear blue sky, midday
105 100 kilolux 110 kiloluxBright sunlight
120 kiloluxBrightest sunlight

See also

References
  1. 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 223607. PMID 16591742. Retrieved 2006-11-10.
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