Using a moving mirror goniophotometer to test decorative lights.

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Evaluating decorative lights using a moving mirror goniophotometer is a little more complicated than testing flood lights, and it normally requires the processes that are outlined in the following paragraphs:

  1. In accordance with the instructions provided by the manufacturer, calibrate the goniophotometer once it has been properly installed. This may include positioning the measuring chamber, adjusting the measurement angles, and confirming the accuracy of the photometer or lux meter.
  2. Place the decorative light to be examined within the measuring chamber of the goniophotometer. Ensure that the light is placed firmly and that it is aligned with the rotation axis of the goniometer.
  3. Adjust the measurement angles on the goniophotometer so that they correspond to the angles given in the standard that you are using. For instance, if you are using ANSI C78.81 or IESNA-63, set the measurement angles on the goniophotometer so that they match those angles.
  4. The goniophotometer's photometer or lux meter should be used to measure the illuminance at each angle, and the goniometer's mirror should be moved to the required angle before the measurement is taken.
  5. Calculate the photometric parameters such as luminous flux, the luminous intensity, the luminous efficacy, and the coefficient of utilization by making use of the illuminance values that were measured in addition to the formula that was provided in the standard that you are using.
  6. In the event that it is necessary to do so, repeat the measurement in a number of different locations, most often on the surface of the light.

Please be aware that the measuring chamber of the photometric instrument may be awkwardly shaped to accommodate some decorative lights because of their intricate designs, which can make it challenging to set these lights accurately. In addition, the aesthetic aspect of decorative lights is often taken into consideration throughout the evaluation process in addition to the photometric performance of the lights. As a result of this, it is essential to use a mix of goniophotometer data and visual assessments in order to evaluate their overall performance. 



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