LM-75 goniophotometer measurement for LED lighting products

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The Illuminating Engineering Society of North America (IESNA) is the organization that developed and published the standard known as LM-75. These standard details the procedure for assessing the photometric performance of LED lighting products with the use of a goniophotometer. The standard is used extensively within the 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 the LM-75, the measurements are collected at various angles along the vertical and horizontal axes. The findings are then used to compute the average and maximum intensity of the light, as well as the uniformity of the light distribution.

Additionally, the LM-75 standard details the requirements that must be met by the goniometer instrument itself. These requirements include the accuracy of the measurements that can be taken with the device, the required measurement angles, and the processes that must be followed when 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 LM-75 standard is intended for use with 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 also exist, and it is essential to determine whether the standard you are adhering to is the appropriate one for the application.


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