How to use a goniophotometer to measure LED light according to EN13032-1?

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Photometric performance of LED (Light Emitting Diode) modules used in general lighting applications is outlined in EN 13032-1, a European standard. For LED modules that will be part of a larger lighting system, this standard establishes the bare minimum in terms of photometric performance. This includes standards for luminous flux, luminous intensity distribution, chromaticity, and color rendering. The goniophotometer, a device used to measure the angular distribution of light produced by a light source, is one of the test techniques and measurement processes required by the standard to assess the photometric performance of LED modules.

EN 13032-1's goal is to standardize the process of measuring and reporting the photometric performance of LED modules used in general lighting applications. The standard aids in making sure that LED lighting systems achieve the expected performance and quality and gives customers the data they need to make educated purchases.

To determine an LED's luminosity in accordance with EN 13032-1, one must do the following procedures.

  • Calibration of the goniophotometer against a known standard is required prior to use. For precise LED light output measurements, this is a mandatory step.
  • Mount the LED firmly to the goniophotometer so that its center coincides with the goniometer's center of rotation.
  • It is recommended to establish the measurement circumstances according to EN 13032-1, which includes the measuring distance and ambient temperature.
  • The goniophotometer should be turned on so that it may circle the LED and measure the light from all sides. It is recommended to record the angular distribution of the light output at each angle in a polar coordinate system.
  • The acquired information must be processed in order to calculate the luminous intensity distribution, a metric for the light's output in relation to its angle of incidence. With the radial axis standing for the brightness and the angular axis for the angle, the data should be shown as a polar plot or polar chart.
  • Measuring findings, including measurement circumstances, luminous intensity distribution, and total luminous flux, shall be recorded in accordance with EN 13032-1.

It must be stressed that the precision of the measurement relies on the high standard of the goniophotometer, the precision of the calibration, and the exactitude of the measurement itself. Repeating the measurement numerous times is also suggested to guarantee consistent results.

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