Source: Wikipedia
| Illuminance (lux) | Surfaces illuminated by |
|---|---|
| 0.0001 | Moonless, overcast night sky (starlight) |
| 0.002 | Moonless clear night sky with airglow |
| 0.05–0.3 | Full moon on a clear night |
| 3.4 | Dark limit of civil twilight under a clear sky |
| 20–50 | Public areas with dark surroundings |
| 50 | Family living room lights (Australia, 1998) |
| 80 | Office building hallway/toilet lighting |
| 100 | Very dark overcast day |
| 150 | Train station platforms |
| 320–500 | Office lighting |
| 400 | Sunrise or sunset on a clear day. |
| 1000 | Overcast day; typical TV studio lighting |
| 10,000–25,000 | Full daylight (not direct sun) |
| 32,000–100,000 | Direct sunlight |