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HomeCharacterizationPhotometric and colorimetric measurements

Photometric and colorimetric measurements

The objective of photometry and colorimetry measurements is to characterize the performance of light sources and lighting systems: LEDs, lamps, luminaires, motor vehicle lights, screens, indicators, panels …PISEO has skills and equipment to provide you with objective, impartial and quality measurement results.

Thereby, these results allow you to check the performance of your products in accordance with regulatory requirements, as well as to stress their value.

Photometric measurements

Goniophotometry measurements allow to characterize the shape of the beam of a source or a light system in 3D.

Based on measurements of light intensity as a function of the angle, these measurements are particularly useful for predicting the illuminations of any illuminated surface and preventing glare (ULR).

The data is recorded in a file of IES or LDT type and can be directly used by lighting simulation software such as Dialux or Relux.

Moreover, these measurements are realized under COFRAC accreditation according to internationally recognized standards: EN 13032-1, EN 13032-4, CIE S025 and LM 79.

Through these measures, we can provide you with accredited reports containing the following characteristics:

  • Total luminous flux (lumens)
  • Intensities (candelas – cd)
  • Intensity distribution: IES or LDT files
  • Light emission spectrum (300nm to 11100nm)
  • Colorimetric data in the axis: chromaticity coordinates (x, y), Correlated Color Temperature (CCT), Color Rendering Index (CRI), TM-30 (Rg, Rf)
  • UGR tables (glare)
  • Total system power consumption (W)
  • Luminous efficacy (lumens / W)
  • Power factor
  • Energy efficiency class *
  • Total Harmonic Distorsion (THD) rate *


  • Gonio-photometer LMT GO DS 2 000 with far-field C-type mirror
  • Yokogawa WT 3000 puissancemeter
  • Instrument Systems CAS140CT (360nm-830nm) and CAS140D (300nm-1100nm) spectrophotometers

Colorimetric measurements with an integrating sphere

Measurements in an integrating sphere allow the characterization of the photometric and colorimetric performances of a light source or a light system.Based on a radiometric measurement using a spectroradiometer, this characterization is carried out under COFRAC accreditation under controlled test conditions, in accordance with internationally recognized standards: EN 13032-1, EN 13032-4, CIE S025 and LM-79.

Through these measures, we can provide you with accredited reports containing the following characteristics:

colorimetry sphere
  • Luminous flux (lumens)
  • Light emission spectrum (wavelength from 300nm to 1100nm)
  • Color data: color coordinates (x, y), color temperature (CCT), color rendering index (CRI), Ra, 14 color CRI, TM-30 (Rg, Rf)
  • Total electrical power consumed (W)
  • Luminous efficacy (lumens / W)
  • Power factor
  • Energy efficiency class *
  • Harmonic distortion rate *Flux lumineux (lumens)

Colorimetry measurement equipment

  • Integrating spheres Instrument Systems 2m and GL Optik 50cm
  • Spectroradiometers Instrument Systems CAS 120 and 140CT (360-830nm), CAS140D (300nm-1100nm)
  • Yokogawa WT 3000 power meter
  • DC and AC stabilized power supplies
  • Temperature regulated device (cool plate) for measuring the performance of LED packages under different electrical and thermal operating conditions (Tj control)

spectral measurement

* these characteristics are outside of our scope of accreditation.