Lighting expert since 1979
60-day money-back guarantee
4.96/5
+49 (0) 8571 6600
Back

Rated illuminance

The term “nominal illuminance” refers to the average illuminance in a furnished room, based on the average level of aging of the luminaire. To specify the value for a new lighting system, the nominal illuminance had to be multiplied by a design factor of 1.25, since it always refers to an average level of aging. It is measured and specified in lux. The nominal illuminance was then used, for example, in workplace guidelines, where the appropriate lighting conditions were based on a horizontal work surface at a height of 85 cm above the floor. For computer work in offices, 500 lux was recommended, among other values, and for drafting offices, twice that amount was recommended.  All of this was important for determining the correct lighting conditions, as this was the only way to perform visual tasks without excessive strain on the eyes. However, the nominal illuminance is no longer used in lighting standards today. Instead, the DIN-EN standards now specify so-called maintenance values for illuminance levels.  These new values also take into account the decline in illuminance due to soiling and the aging of light sources.

Our must-reads

Show all
Eine Gruppe fröhlicher junger Menschen lächelt gemeinsam in einem sonnigen Park.

Join the skapetze® Membership

Collect points, discover new products and enjoy exclusive benefits

Join now for free