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The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes 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 visual brightness perception. In English, "lux" is used in both singular and plural.[1]

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cen0008-337-quality-and-accurate-digital-lightmeter-0-01-lux
CEN0008-337 Quality and Accurate Digital Lightmeter 0.01 lux 5 Digital Display. Auto Ranging. Automatic Power Off. Fc / lx Function Selectable. HOLD Function. Range Display. Automatic Zero When Power On. Light/Lux meters
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CEN0063-USA 750 CLASS AA HANDHELD LIGHT METER WITH FLEXIBLE ROTATABLE SENSOR Featured item   Storage Temperature:Dimension / Weight:Accessories:169(L)×63(W)×37(H)mm (6.7”×2.5”×1.5”)Battery, instruction manual, carrying case.-10 to 50°C (14 to 122°F)Accuracy: ±3% (Calibrated to standard incandescentlamp 2856°K)Temperature characteristics:Response time: 0.5 secLight detector: SI PhotodiodeOperation temperature: 0°C ~ 40°C(32°F ~ 104°F)Operation humidity: 0~80% RHStorage Humidity: 0 to 70% RHSpecificationsMeasuring level range: 0.0 to 199.9/1999/19990/199900... Light/Lux meters
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CAX0132-CHAUVIN ARNOUX CA1110 DATALOGGING LIGHT METER 200000 LX Featured item The Chauvin Arnoux CA1110 is a Datalogging Light Meter capable of measuring the illuminance of all light sources (LED, fluorescent, incandescent, etc.) up to 200,000 lux in compliance with Class C of the NF C 42-710 standard. With the MAP function, you can produce a map of a surface or room in order to check that the illuminance is uniform. The sensor head is magnetic enabling it to be fixed to the product for one-handed use or for easy transport, but it is also possible to use it remotely... Light/Lux meters