Lux
From Fiswiki
A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance. It is used in photometry as a measure of the apparent intensity of light hitting or passing through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human brightness perception.
| Illuminance | Example |
|---|---|
| 10-5 lux | Light from the brightest star (Sirius)<ref name="radfaq">Paul Schlyter, Radiometry and photometry in astronomy FAQ (2006)</ref> |
| 10-4 lux | Total starlight, overcast sky<ref name=radfaq/> |
| 0.002 lux | Moonless clear night sky with airglow<ref name=radfaq/> |
| 0.01 lux | Quarter moon |
| 0.27 lux | Full moon on a clear night<ref name=radfaq/><ref>Template:Cite web</ref> |
| 1 lux | Full moon overhead at tropical latitudes<ref>Template:Cite journal</ref> |
| 3.4 lux | Dark limit of civil twilight under a clear sky<ref>Template:Cite web</ref> |
| 50 lux | Family living room<ref>Template:Citation.</ref> |
| 80 lux | Hallway/toilet<ref>Template:Citation.</ref> |
| 100 lux | Very dark overcast day<ref name=radfaq/> |
| 320 lux | Recommended office lighting (Australia)<ref>Template:Cite web</ref> |
| 400 lux | Sunrise or sunset on a clear day. Well-lit office area. |
| 500 lux | Lighting level for an office according to the European law UNI EN 12464. |
| 1,000 lux | Overcast day<ref name=radfaq/>; typical TV studio lighting |
| 10,000–25,000 lux | Full daylight (not direct sun)<ref name=radfaq/> |
| 32,000–130,000 lux | Direct sunlight |
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Reference
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