Orders of magnitude (illuminance)
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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 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 or sunrise |
< 1 lux | Moonlight[3] | ||
101 | 1 decalux | 40 lux | Fully overcast, sunset or 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[]
- ^ a b c d e Paul Schlyter, Radiometry and photometry in astronomy FAQ (2006)
- ^ "Petzl reference system for lighting performance". Archived from the original on 2008-06-20. Retrieved 2007-04-24.
- ^ Bunning, Erwin; Moser, Ilse (April 1969). "Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction". 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.[dead link]
Categories:
- Orders of magnitude
- Photometry