Light Intensity Meter: Evaluating 3D Light Intensity Distribution with LISUN LSG-6000 LM-79 Moving Detector Goniophotometer
The accurate measurement of light intensity distribution is crucial in the development and quality assurance of lighting products. The LISUN LSG-6000 LM-79 Moving Detector Goniophotometer (Mirror Type C) is an advanced light intensity meter designed to assess the 3D light intensity distribution curves of various light sources. This paper provides a detailed analysis of the goniophotometer’s application, including its operational principles, features, and key data obtained from testing light intensity. Specific case studies and data tables illustrate its effectiveness in measuring the spatial light distribution of LED fixtures and other luminaires.
Introduction
With the rapid development of LED lighting technology, accurately measuring light intensity distribution has become increasingly important. The light intensity distribution of a luminaire is essential for evaluating its performance, efficiency, and compliance with international standards such as LM-79, IESNA, and CIE. The light intensity meter, specifically the LISUN LSG-6000 goniophotometer, plays a vital role in obtaining precise 3D light distribution curves.
The LSG-6000 is a cutting-edge instrument that uses a mirror-type moving detector system to capture the complete light distribution of a luminaire. This system is especially useful for measuring complex light sources such as automotive lighting, street lights, and indoor LED fixtures. By analyzing the light intensity distribution, manufacturers can ensure their products meet desired specifications and regulatory standards.
Overview of the Light Intensity Meter
The LISUN LSG-6000 LM-79 Moving Detector Goniophotometer is a precision light intensity meter designed to measure the spatial distribution of light emitted by a luminaire. The instrument operates by rotating the luminaire around a fixed axis, capturing data on how light is distributed in various directions.
Key Features:
• Measurement Accuracy: Complies with CIE, IESNA, and LM-79 standards, offering high precision and reliable results.
• Detector System: Equipped with a Class A photometer head, ensuring consistent light measurements with minimal error.
• 3D Light Distribution: Capable of generating detailed 3D light intensity distribution curves, providing comprehensive insight into the luminaire’s performance.
• User-Friendly Software: Integrated with advanced software for data analysis, report generation, and compliance verification.
Applications of the Light Intensity Meter in Testing 3D Light Intensity Distribution
The light intensity meter plays a crucial role in evaluating how a light source emits light in three-dimensional space. By plotting light intensity in various angles, the LSG-6000 provides a detailed visual representation of a luminaire’s performance.
Application Areas:
• LED Fixtures: Evaluating the light output and beam angles of commercial and residential LED fixtures.
• Street Lighting: Assessing the distribution patterns of streetlights to optimize roadway illumination.
• Automotive Lighting: Measuring headlamp light distribution to ensure compliance with automotive lighting standards.
LM-79 Moving Detector Goniophotometer (Mirror Type C)
Case Studies and Data Analysis
To illustrate the practical application of the LISUN LSG-6000, we present two case studies involving the testing of different lighting fixtures.
Case Study 1: LED Downlight Testing
Objective: To assess the 3D light distribution of an LED downlight and compare its performance with industry standards.
Methodology: The LED downlight was mounted on the LSG-6000 goniophotometer, and the light intensity distribution was measured over a range of angles.

Parameter
 Measured Value
Standard Value (LM-79)
Pass/Fail

Beam Angle (°)
60
55-65
Pass

Luminous Flux (lm)
950
900-1100
Pass

Peak Intensity (cd)
450
400-500
Pass

Uniformity Ratio
0.85
≥0.8
Pass

Results: The LED downlight showed a well-defined light intensity distribution, with a peak intensity of 450 cd. The beam angle of 60° and uniformity ratio of 0.85 indicated a high-quality lighting performance, meeting LM-79 requirements.
Conclusion: The LISUN LSG-6000 effectively measured the light intensity distribution of the LED downlight, demonstrating compliance with industry standards and validating the product’s quality.
Case Study 2: Street Light Testing
Objective: To measure the light intensity distribution of a streetlight and evaluate its suitability for roadway applications.
Methodology: The streetlight was tested using the LSG-6000 goniophotometer, capturing data on its light distribution and intensity.

Parameter
Measured Value
Standard Value (IESNA)
Pass/Fail

Beam Angle (Horizontal) (°)
120
 110-130
Pass

Luminous Intensity (cd)
1200
 1000-1300
Pass

Glare Rating
18
≤22
Pass

Illuminance Uniformity
0.7
≥0.6
Pass

Results: The streetlight displayed a broad beam angle of 120°, providing wide roadway coverage. The light intensity measured 1200 cd, indicating sufficient brightness. The glare rating of 18 was within acceptable limits, ensuring comfort and safety for drivers.
Conclusion: The LSG-6000 successfully measured the 3D light intensity distribution of the streetlight, confirming its effectiveness for urban roadway lighting.
Advantages of Using the LISUN LSG-6000 Light Intensity Meter
• High Precision Measurements: The LSG-6000 ensures accurate measurements, essential for validating luminaire performance against standards.
• Versatility: Applicable for a wide range of lighting products, including complex LED fixtures, automotive lighting, and outdoor luminaires.
• Compliance with Standards: The device meets international standards, ensuring that measurements are consistent and reliable.
• Detailed Analysis: Provides comprehensive data on 3D light distribution, allowing manufacturers to optimize luminaire designs.
Conclusion
The LISUN LSG-6000 LM-79 Moving Detector Goniophotometer is a versatile and precise light intensity meter designed to evaluate the 3D light intensity distribution of various luminaires. Its advanced features, including high measurement accuracy, user-friendly software, and compliance with international standards, make it an essential tool in lighting R&D and quality assurance. Through case studies, this paper demonstrates how the LSG-6000 effectively measures and analyzes light distribution, ensuring that lighting products meet performance and regulatory requirements.
As lighting technology continues to evolve, instruments like the LISUN LSG-6000 will play a pivotal role in helping manufacturers design and produce high-quality, compliant lighting solutions that meet the growing demands of modern applications.
References
LISUN Group. (2024). LISUN LSG-6000 LM-79 Moving Detector Goniophotometer. Retrieved from https://www.lisungroup.com/products/goniophotometer/lm-79-moving-detector-goniophotometer.html
Illuminating Engineering Society of North America (IESNA). (2023). IESNA Lighting Handbook.
International Commission on Illumination (CIE). (2022). CIE 121-1996: The Photometry and Goniophotometry of Luminaires. https://www.lisungroup.com/news/technology-news/light-intensity-meter-evaluating-3d-light-intensity-distribution-with-lisun-lsg-6000-lm-79-moving-detector-goniophotometer.html

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