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The amount of light falling on a unit area of a surface.


Building regulations and standards use illuminance to specify the minimum light levels for specific tasks and environments – to ensure optimal visual comfort

  • Light levels that are lower than required can induce eyestrain and headaches.
  • If the light level begins to exceed what is required, it becomes an energy waste issue.



Levels of illumination recommended for different function of tasks performed.





100000 Lux

Summer – bright day



5000 Lux

Overcast sky



750 Lux

Office, illuminated




100 Lux

Living or hotel room


5th icon


0.25 Lux

Moonlight - clear sky


Recommended illuminance (LUX)


Each type of activity described spans three LUX values





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Organized by The Climate Group in partnership with Signify


June 28

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July 26

Webinar: The 3 CLUE winners sharing their projects - Light and the senses

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