Glare Measurement with the LISUN GTS-LS Glare Test System: Analyzing Outdoor Disability Glare and Indoor Discomfort Glare Using F24-70mm and Fish-Eye Lenses

Abstract
In the field of lighting design, glare is a significant factor influencing visual comfort and safety. The ability to measure and assess glare, especially in complex environments, is crucial for ensuring optimal lighting. This paper explores the use of the LISUN GTS-LS Glare Test System, which utilizes F24-70mm lenses and fish-eye lenses for glare measurements in both outdoor disability glare and indoor discomfort glare scenarios. The system’s software automatically identifies the background and the human eye’s field of view, determining the contribution of each light source to the overall glare. The system can complete the entire measurement, analysis, and report generation process in as fast as two seconds, providing a rapid and automated means of glare assessment in various lighting environments.

Introduction
Glare is a visual phenomenon that can significantly impact human vision and comfort, especially in lighting installations. In outdoor environments, disability glare can reduce visibility, posing safety risks, while indoor discomfort glare affects visual comfort without necessarily impairing visibility. Effective glare measurement is essential to ensure that lighting systems meet safety and comfort standards. Traditional methods of glare assessment can be slow and labor-intensive, requiring manual measurements and extensive data analysis. To address these challenges, automated systems like the LISUN GTS-LS Glare Test System have been developed to provide faster, more accurate glare measurements.

The LISUN GTS-LS Glare Test System is designed to automate the glare measurement process, using F24-70mm lenses and fish-eye lenses to assess both outdoor disability glare and indoor discomfort glare. The system’s software is capable of automatically identifying the background and the field of view of the human eye, providing detailed insights into the contribution of individual light sources to overall glare. This article will detail the system’s capabilities and demonstrate how it facilitates fast, automated glare measurement in both indoor and outdoor settings.

Glare Measurement: Concepts and Importance
Glare Types:
• Disability Glare: Occurs when intense light from a source causes a reduction in visibility, often in outdoor settings such as streets, parking lots, or open areas.
• Discomfort Glare: Refers to the discomfort experienced when light is bright enough to disturb visual comfort without necessarily impairing visibility. It commonly occurs in indoor settings, such as offices, shopping malls, or homes.
Both types of glare can lead to a variety of issues, including reduced visibility, eye strain, and visual fatigue. The accurate measurement of glare is critical in assessing the performance of lighting systems and ensuring they meet regulatory and ergonomic standards.

The LISUN GTS-LS Glare Test System: Overview
The LISUN GTS-LS Glare Test System offers a comprehensive solution for glare measurement in both indoor and outdoor environments. The system employs advanced imaging technology, including F24-70mm and fish-eye lenses, to capture and analyze light distribution. The F24-70mm lens is ideal for measuring outdoor disability glare, as it allows for a focused, zoomed-in capture of the light source and its impact on the surrounding environment. The fish-eye lens, on the other hand, is well-suited for indoor discomfort glare measurements, providing a wide-angle view of the light sources and their spatial distribution.

System Capabilities
1. Fast Measurement and Analysis
The LISUN GTS-LS Glare Test System is designed for speed. The system can complete the entire process of glare measurement, analysis, and report generation in as little as two seconds. This rapid measurement capability is essential in environments where time efficiency is critical, such as during large-scale lighting evaluations or production line inspections.

2. Automated Background and Field of View Identification
One of the standout features of the LISUN GTS-LS system is its software’s ability to automatically identify the background and the human eye’s field of view. The system distinguishes between the light sources contributing to glare and other environmental factors, ensuring that only relevant data is included in the analysis. This automation greatly reduces the complexity and time involved in manual glare measurements.

3. Glare Contribution by Light Source
The system provides a detailed analysis of the contribution of each light source to the overall glare. This feature is particularly useful for designers and engineers looking to optimize lighting systems. The data allows for targeted adjustments to reduce glare without compromising the effectiveness of the lighting.

4. Automated Report Generation
Once the measurement and analysis are complete, the system automatically generates a comprehensive report detailing the glare levels, light source contributions, and other relevant metrics. This report can be exported for further review or documentation, streamlining the evaluation process.

Outdoor Disability Glare Measurement
Outdoor lighting applications, such as streetlights and parking lot lights, often involve high-intensity light sources that can cause disability glare. Disability glare occurs when intense light from a source enters the eye, reducing contrast and making it difficult to see objects in the environment.
Using the F24-70mm lens, the LISUN GTS-LS Glare Test System measures disability glare in outdoor environments by capturing focused images of the light source and its effect on surrounding areas. The system automatically calculates the glare index based on factors such as light intensity, angle of incidence, and the viewer’s position. The result is a precise assessment of how the light source impacts visibility.

Indoor Discomfort Glare Measurement
Indoor discomfort glare typically occurs when the lighting in a space is too intense or poorly positioned, causing discomfort for the occupants without necessarily reducing visibility. This type of glare is commonly encountered in offices, shopping malls, and other indoor spaces.
For indoor measurements, the LISUN GTS-LS system uses the fish-eye lens to capture a wide-angle image of the lighting environment. The system then identifies the field of view, distinguishing between the light sources and the background. By analyzing the intensity and distribution of light, the system quantifies the discomfort glare and provides recommendations for optimizing the lighting layout to reduce glare.

Data Analysis and Reporting
The software integrated with the LISUN GTS-LS Glare Test System offers advanced data analysis features. After capturing the images and performing the glare measurement, the system automatically generates a report detailing the following metrics:
• Disability Glare Index (DGI) for outdoor measurements
• Discomfort Glare Index (DGI) for indoor measurements
• Light Source Contribution to overall glare
• Background Light Level in the viewing area
Table 1: Sample Data of Glare Measurement

Light Source	Intensity (cd)	Disability Glare (DGI)	Discomfort Glare (DGI)	Contribution to Glare (%)
Streetlight 1	1500	3.5	0.5	35%
Streetlight 2	1200	2.8	0.3	28%
Ambient Light	500	1.2	0.1	10%
Total	–	4.7	0.9	73%

Conclusion
The LISUN GTS-LS Glare Test System provides a rapid, automated solution for glare measurement in both outdoor and indoor environments. Using F24-70mm and fish-eye lenses, the system captures detailed images of the lighting environment, automatically identifies the relevant glare factors, and analyzes the contribution of each light source. The system’s ability to complete measurements, analysis, and reporting in as little as two seconds makes it an invaluable tool for lighting designers, engineers, and safety professionals. With its ability to assess both disability glare and discomfort glare, the LISUN GTS-LS is a versatile and efficient solution for glare measurement.

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