How to do street light photometric measurement according to CIE 121 using a goniophotometer?

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The process of measuring the light output of street lights and evaluating the data to derive critical characteristics such as luminous intensity, luminous flux, chromaticity coordinates, color temperature, and color rendering index is referred to as street light photometric measurement (CRI). The purpose of this measurement is to guarantee that street lights provide an accurate, consistent, and high-quality amount of light that is in accordance with the standards set by the industry.

  • Position the goniophotometer in an area that is devoid of impediments and is representative of the setting in which the street light is meant to function. Place the street light in the appropriate location on the goniophotometer and check to see that it is secured firmly.
  • Adjust the settings on the goniophotometer to guarantee precise readings by adjusting the settings on the goniophotometer in accordance with the instructions provided by the manufacturer.
  • The goniophotometer should then be positioned as follows: Rotate the head of the goniophotometer to the stated angles to measure the light output of the street light from a variety of angles. Measurements need to be conducted at a total of sixty distinct angles in order to comply with the CIE 121 standard.
  • Measure the light output from each vantage point and record the results so that you may analyze them later.
  • Make use of specialized software to conduct an analysis of the data and arrive at crucial conclusions about the luminous intensity, luminous flux, chromaticity coordinates, color temperature, and color rendering index (CRI).
  • In order to assess whether or not the street light satisfies the necessary specifications, compare the computed parameters to the performance criteria established by the CIE121 standard.

Lighting experts and manufacturers may guarantee that their products offer accurate, consistent, and high-quality light output that satisfies industry requirements by completing a street light photometric measurement using a goniophotometer. This contributes to the guarantee that real-world uses of street lights make use of them in an effective and efficient manner.

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