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How to understand Lux and its meaning.

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Definition of Lux

Lux is a standardised unit of measurement of the light intensity (which can also be called “illuminance” or “illumination”) - as an example for reference purposes - 1 lux is equal to the illumination of a surface one metre away from a single candle. Some further examples of settings with the average recommended illuminance is measured in lux is shown below:

  • Outdoor average sunlight ranges from 32 000 to 100 000 lux
  • Warehouse aisles are lit to approx 100-200 lux
  • A bright office requires about 400 lux of illumination
  • At sunset and sunrise (with a clear sky), ambient outdoor light is also about 400 lux
  • Building corridors can be lit adequately at around 100 lux
  • Moonlight represents about 1 lux

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