NEN EN 13201-3 : 2016

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviations
  3.1 Terms and definitions
  3.2 List of symbols and abbreviations
4 Mathematical conventions
5 Photometric data
  5.1 General
  5.2 The I-table
  5.3 Interpolation in the I-table
      5.3.1 General
      5.3.2 Linear interpolation
      5.3.3 Quadratic interpolation
      5.3.4 Quadratic interpolation in the region of
             C = 0 degree, or Gamma = 0 degree or 180 degrees
  5.4 The r-table
  5.5 Interpolation in the r-table
6 Calculation of I(C, gamma)
  6.1 General
  6.2 Mathematical conventions for distances measured on the
      road
  6.3 Mathematical conventions for rotations
  6.4 Calculation of C and Gamma
7 Calculation of photometric quantities
  7.1 Luminance
      7.1.1 Luminance at a point
      7.1.2 Total luminance at a point
      7.1.3 Field of calculation for luminance
      7.1.4 Position of calculation points
  7.2 Illuminance
      7.2.1 General
      7.2.2 Horizontal illuminance at a point
      7.2.3 Hemispherical illuminance at a point
      7.2.4 Semicylindrical illuminance at a point
      7.2.5 Vertical illuminance at a point
      7.2.6 Total illuminance at a point
      7.2.7 Field of calculation for illuminance
      7.2.8 Position of calculation points
      7.2.9 Luminaires included in calculation
      7.2.10 Illuminance on areas of irregular shape
8 Calculation of quality characteristics
  8.1 General
  8.2 Average luminance
  8.3 Overall uniformity
  8.4 Longitudinal uniformity
  8.5 Threshold increment
  8.6 Surround ratio
  8.7 Measures of illuminance
      8.7.1 General
      8.7.2 Average illuminance
      8.7.3 Minimum illuminance
      8.7.4 Uniformity of illuminance
9 Ancillary data
Bibliography

Defines the conventions and mathematical procedures to be adopted in calculating the photometric performance of road lighting installations designed in accordance with the parameters described in EN 13201-2 to ensure that every lighting calculation is based on the same mathematical principles.