CIE 121 goniophotometer photometric measurement for landscape lighting

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CIE 121 is a standard that was released by the International Commission on Illumination (CIE). This standard outlines the procedure that should be used for testing the photometric performance of landscape lighting by utilizing a goniophotometer. The standard is used extensively within the lighting industry for the purpose of evaluating the efficacy of landscape lighting fixtures with regard to the distribution, intensity, and homogeneity of the light they produce.

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 CIE 121, the measurements are collected at various angles along the vertical and horizontal axes, 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 CIE 121 standard. These requirements include the required measuring angles, the required precision of the goniophotometer's measurements, and the processes that must be followed while carrying out 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 CIE 121 standard is designed specifically for the illumination of outside landscapes; as a result, it cannot be applied to other types of light sources, including inside lighting systems. Additionally, the standard is not the only one for photometric measurements; other standards such as ANSI C78.81 or IESNA LM-79 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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