What do you know about ANSI C78.81 goniophotometer photometric measurement?

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ANSI C78.81 is a standard that was published by the American National Standards Institute (ANSI). This standard specifies the method for measuring the photometric performance of outdoor lighting fixtures, such as streetlights and floodlights, using a gonio spectrophotometer. Examples of these types of fixtures include floodlights and streetlights. For the purpose of evaluating the efficacy of outdoor lighting fixtures in terms of the distribution, intensity, and uniformity of the light they emit, the standard is put to widespread use in both the United States and Canada.

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 case of ANSI C78.81, the measurements are taken at various angles around the vertical and horizontal axis, and the results are used to calculate the average and maximum intensity of the light, as well as the uniformity of the light distribution. In addition, the results are used to determine the degree to which the light is distributed evenly.

Additionally, the specifications for the goniophotometer itself are specified in the ANSI C78.81 standard. These requirements include the required measuring angles, the required precision of the goniophotometer's readings, and the processes that must be followed while taking the readings. 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 ANSI C78.81 standard is intended for use with outdoor lighting fixtures; it is not appropriate for use with inside lighting fixtures. In addition, the standard is not the only one that can be used for photometric measurements; other standards, such as IESNA LM-79, also exist. Because of this, it is essential to determine whether or not the standard that you are adhering to is the appropriate one for the application.

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