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Illuminance Surfaces illuminated by:
10−4 lux Moonless, overcast night sky (starlight)[2]
0.002 lux Moonless clear night sky with airglow[2]
0.27–1.0 lux Full moon on a clear night[2][3][4]
3.4 lux Dark limit of civil twilight under a clear sky[5]
50 lux Family living room lights (Australia, 1998)[6]
80 lux Office building hallway/toilet lighting[7][8]
100 lux Very dark overcast day[2]
320–500 lux Office lighting[9][10][11]
400 lux Sunrise or sunset on a clear day.
1,000 lux Overcast day;[2] typical TV studio lighting
10,000–25,000 lux Full daylight (not direct sun)[2]
32,000–130,000 lux Direct sunlight
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