Calculations and Measurements

  • Wout van Bommel


The lighting designer has to perform lighting calculations in order to arrive at solutions that satisfy the relevant lighting requirements. Universally applicable computer programs are available for this purpose. The lumen method of calculating the lighting level on the working plane is a simplified “calculation-by-hand” method. It provides unexperienced lighting designers with a tool to learn, for different types of light distribution, the effect the room dimensions and reflectances have on the resulting average horizontal illuminance of the room.

The measurements carried out in connection with interior lighting fall into three categories: those to determine the lamp properties, the luminaire properties and the installation properties. The measurements of the first two categories are mostly carried out in laboratories. They concern the measurement of the luminous flux of lamps and luminaires, the light distribution and light-emitting area of luminaires and the spectral data of lamps.

Field measurements are carried out on new installations to check whether they fulfil the quality specifications, and on installations already longer in use to reveal whether there is a need for maintenance, modification or perhaps replacement. They concern illuminance, luminance and glare measurements. Light-logging devices are used to gather information about the light dose persons are receiving under different circumstances. The principles of both laboratory and field measurements are discussed in this chapter.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Wout van Bommel
    • 1
  1. 1.Van Bommel Lighting ConsultantNuenenThe Netherlands

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