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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.

10-5 lux Light from the brightest star (Sirius)<ref name="radfaq">Paul Schlyter, Radiometry and photometry in astronomy FAQ (2006)</ref>
10-4 luxTotal starlight, overcast sky<ref name=radfaq/>
0.002 luxMoonless clear night sky with airglow<ref name=radfaq/>
0.01 luxQuarter moon
0.27 luxFull moon on a clear night<ref name=radfaq/><ref>Template:Cite web</ref>
1 luxFull 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 luxFamily living room<ref>Template:Citation.</ref>
80 luxHallway/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 luxOvercast 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 luxDirect sunlight

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