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Illuminance Intensity

ABBREVIATIONS: E / MEASUREMENT UNIT: lx - lux

This is the measure of the light appearing on a surface. Their unit is lux (lat. brightness). It decreases with the distance to the light source. At double the distance, the luminous flux is distributed over four times the area. The better you want to see, the higher the required illuminance. The mean illuminance is an average value of E relative to an area.

Standard values for nominal illuminance

Room | Activity E in lx
Storage Rooms 50
Rough Work 200

Turning / Milling

300
Winding of Coils 500
Office Facilities 500
Classroms 500
Drawing Office 750
Colour Verification 1000

 

Luminous intensity distribution of an interior light (left) / luminous intensity distribution of a street light (right)
Lichtstärkeverteilung einer Innenleuchte (links) / Lichtstärkeverteilung einer Straßenleuchte (rechts)

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