Uniformity of illuminance

Minimum illuminance uniformity values in the visual task area are defined separately, e.g. for work places according to EN 12464-1, and can be gathered from the respective tables, e.g. table.

Uniformity U0 is defined as the quotient Ēmin/Ē of minimum and average illuminance in the visual task area, keeping in mind that this minimum value must not be undercut at any time. Where the decrease in minimum illuminance due to degradation or premature failure of individual lamps progresses more rapidly than the decrease in average illuminance, maintenance or cleaning of the installation must be effected as soon as minimum uniformity is reached.

The uniformity of illuminance U0 for the immediate surrounding area should be at minimum 0,40. The determination of uniformity requires a sufficiently close sequence of calculated or measured localised illuminance values to be able to determine minimum illuminance. For details, see chapter "Lighting measurement".

3.1.2.6.4 Background lighting
3.1.2.7 Luminance distribution

SUBJECT SEARCH

  1. Essential requirements for good lighting
  2. Quality criteria of lighting
    1. Guidelines
    2. Overview
    3. Work places
    4. Visual task area
    5. Surrounding area
    6. Illuminance
      1. Illuminance at the visual task area
      2. Specific visual requirements (explanation of the matrix in figure 1.12)
      3. Illuminance in the immediate surrounding area
      4. Background lighting
      5. Uniformity of illuminance
    7. Luminance distribution
    8. Limitation of glare
    9. Lighting direction, modelling
    10. Aspects of colour
    11. Flicker and stroboscopic effects
    12. Daylight
  3. General requirements
  4. Specific lighting requirements
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