Measurement Standards for Goniophotometry: ANSI, IES, and CIE

Introduction
Because it offers specific information on the manner in which various types of light sources disperse their brightness, goniophotometry is a vital approach for determining how much light there is. For the purpose of ensuring the accuracy and consistency of goniophotometric measurements, a number of international organizations have collaborated to develop standardized units of measurement.

The American National Standards Institute (ANSI), the Illuminating Engineering Society (IES), and the International Commission on Illumination (CIE) have all contributed to the development of these standards, which are the focus of this article. If researchers, manufacturers, and lighting professionals wish to collect reliable and relevant goniophotometric measurements, they need to be conversant with these standards.

ANSI Measurement Standards
The American National Standards Institute (ANSI) has developed a set of standards that outlines the procedures and requirements that are involved in goniophotometric measurements. These rules may be found here. The “ANSI C82” family of standards covers a lot of ground when it comes to goniophotometry, including the following:

ANSI C82.2: The principal areas of measurement for this standard are the luminous flux of LED lighting as well as the color temperature at which it may be maintained. Included are instructions for utilizing goniophotometers to measure the overall luminous flux, spatial distribution, and color attributes of LED products.

ANSI C82.11: This standard places a primary emphasis on the total luminous flux as well as the color uniformity of LED bulbs. The use of goniophotometers to measure light emitting diodes (LEDs) is explained in great depth in the instructions that are provided.

ANSI C82.41: In this standard, the procedures that are to be followed in order to ascertain the spatial distribution of the output of a luminaire are outlined. It describes in great depth how goniophotometers should be calibrated, how various photometric quantities should be computed, and how results should be presented.

The American National Standards Institute assures that lighting commodities and systems may be compared in a fair and consistent manner by developing universal methods for obtaining goniophotometric measurements. These rules ensure that the readings taken are accurate.

IES Measurement Standards
The Illuminating Engineering Society (IES) is responsible for the production of a number of goniophotometry and photometric testing standards. These standards determine how certain photometric quantities should be interpreted as well as the quantities themselves. The following items are among the most essential IES goniophotometry standards:

IES LM-75: This document lays out the procedures for measuring the photometric qualities of luminaires using goniophotometers, and it serves as a standard. Installation, calibration, operation, data collecting, and report writing instructions for the goniophotometer are all included in this package.

IES LM-79: This standard quantifies the electrical and photometric features of lighting devices such as LED luminaires and other solid-state lighting devices. Quantification is performed on a variety of aspects, including light levels, lighting patterns, color rendering, and electrical power characteristics.

IES LM-80: Although this criteria has nothing to do with goniophotometry in and of itself, it is essential for assessing the longevity of LED lighting because of its importance in terms of energy efficiency. It provides criteria for carrying out accelerated life testing of LEDs and analyzing lumen maintenance over time, both of which are essential for determining the usable life of LED goods.

By following to the IES measurement standards, goniophotometric measurements may be carried out in a consistent manner and in accordance with the best practices in the industry. This will result in results that are reliable and trustworthy.

CIE Measurement Standards
The International Commission on Illumination (CIE) is the organization that is considered to be the gold standard when it comes to measuring and defining light and lighting systems. The International Commission on Illumination (CIE) is responsible for the development of a number of different measurement standards relating to goniophotometry, including:

CIE 121: This standard provides suggestions for the use of goniophotometers in the evaluation of the light intensity distributions produced by luminaires. There are a wide variety of photometric variables that may be measured, including intensity, flux, and intensity distribution curves.

CIE 127: The major focus of this standard is placed on the spatial distribution of the light intensity that is produced by lamps and luminaires. When it comes to goniophotometric measurements, topics like as instrumentation, angles of measurement, and data processing are discussed in extensive detail.

CIE 149: Using goniophotometry, which is included in this standard, one may assess both the luminous flux of LED products as well as their color stability. You can select LISUN for the best goniophotometers.

All goniophotometric readings are guaranteed to be accurate and similar across all nations according to the standards of measurement established by the CIE. They give best practices for equipment calibration, measurement techniques, and data processing, which enables exact comparisons and trustworthy evaluations of lighting items and systems.

Figure: Goniophotometer

Harmonization of Standards
There have been efforts made to standardize the measurement standards that have been created by ANSI, IES, and CIE in order to increase consistency and promote worldwide cooperation. These efforts have been successful.

By unifying their nomenclature, measurement techniques, and rules, the purpose of harmonization is to make it possible for researchers, manufacturers, and lighting professionals located in different parts of the world to communicate with one another using the same language.

These organizations have coordinated their efforts, and as a result, they now use a consistent set of standards across the board for all of their measuring needs. It is possible for us to ensure that all of our measurements will be consistent with one another and with other standards if we conduct goniophotometric measurements, for example, using units based on the SI system.

Organizations such as the International Electrotechnical Commission (IEC), who have been working to standardize goniophotometric measurement standards, have made significant contributions to the area as a consequence of their efforts.

The ANSI, IES, and CIE publications have been included into the IEC’s very own published standards, which have been published by the IEC. The convergence of these standards has several positive effects on the lighting industry, including the promotion of interoperability, the streamlining of commercial processes, and the stimulation of new ideas.

Conclusion
Goniophotometric measures that are accurate, consistent, and comparable are highly reliant on the standards that were developed by ANSI, IES, and CIE. These guidelines may be beneficial to the lighting industry as a result of the consistency and harmony they provide to device calibration, measuring methodologies, and the processing of data.

When determining the effectiveness of different lighting alternatives, it will be beneficial for researchers, producers, and lighting professionals to use the same criteria.

Goniophotometry is on the increase as a result of the continual development and standardization of measurement standards, which makes it possible for improvements to be made in the areas of lighting design, energy efficiency, and user satisfaction.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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