IESNA-63 goniophotometer LED light measurement

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IESNA-63 is a standard that was released by the Illuminating Engineering Society of North America (IESNA) and it describes the technique for testing the photometric performance of LED lighting products using a goniophotometer. The standard is used extensively within the goniometer lighting industry for the purpose of evaluating the performance of LED lighting products with regard to the distribution, intensity, and homogeneity of the light produced by the goods.

A goniophotometer is a device that is used to measure the light distribution of a light source by measuring the intensity of the light emitted at different angles. This is accomplished by measuring the light with the use of a device called a goniophotometer. In the instance of IESNA-63, the measurements are collected at various angles along the vertical and horizontal axis, and the findings are used to compute the average and maximum intensity of the light, as well as the uniformity of the light distribution.

Additionally, the specifications for the goniophotometer itself are specified in the IESNA-63 standard. These requirements include the required measuring angles, the required precision of the goniophotometer's measurements, and the processes that must be followed while taking the measurements. It also details the methods of calculation that must be applied in order to derive the photometric parameters of a light source, such as the luminous flux, the luminous intensity, the luminous efficacy, and the coefficient of utilization. For example, the luminous flux is the amount of light that passes through an area per second, while the luminous intensity is the amount of light that passes through.

It is essential to keep in mind that the IESNA-63 standard is designed only for LED lighting products and is not appropriate for use with other types of light sources, such as incandescent or fluorescent bulbs. Additionally, the standard is not the only one for photometric measurements; other standards such as ANSI C78.81, IESNA LM-79 and LM-80 also exist, and it is essential to determine whether the standard you are using is the appropriate one for the application.

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