Introduction to Goniophotometry and Its Importance in Photometric Testing
Goniophotometry is a critical photometric measurement technique used to evaluate the spatial distribution of luminous intensity, color uniformity, and total flux of light sources. A goniophotometer provides precise angular measurements of luminous intensity, enabling comprehensive characterization of lighting products for compliance with international standards.
The LISUN LSG-6000 goniophotometer exemplifies advanced measurement capabilities, designed for high-precision testing in industries such as LED manufacturing, display equipment validation, and urban lighting design. This article explores the technical principles, industry applications, and competitive advantages of the LSG-6000, referencing key international standards such as IEC, CIE, and ANSI.
Technical Specifications and Measurement Principles of the LSG-6000
The LSG-6000 is a Type C goniophotometer with a dual-axis rotation mechanism, allowing for full 3D luminous intensity distribution (LID) analysis. Key specifications include:
- Measurement Range: 0.1 to 500,000 cd
- Angular Resolution: 0.1°
- Distance Range: 5m to 30m (adjustable)
- Spectral Range: 380nm to 780nm (expandable for UV/IR applications)
- Compliance Standards: IEC 60598-1, CIE 70, CIE 121, LM-79, LM-80
The system operates on the inverse-square law principle, where a photodetector measures luminous intensity at varying angular positions while the light source rotates on two perpendicular axes. Data acquisition software processes the angular intensity distribution to generate polar candela plots, isolux diagrams, and total luminous flux calculations.
Industry Applications and Compliance with International Standards
1. LED and OLED Manufacturing
In LED production, the LSG-6000 ensures compliance with IEC 62612 (LED lamp performance) and ANSI C78.377 (chromaticity standards). Manufacturers use goniophotometric data to optimize beam angles, uniformity, and thermal performance.
2. Display Equipment Testing
For LCD and OLED displays, the LSG-6000 measures viewing-angle performance per IEC 61747-1 (liquid crystal display testing). This ensures consistent brightness and color uniformity across wide viewing angles.
3. Photovoltaic Industry
Solar simulators and concentrator photovoltaics (CPV) require precise angular light distribution analysis. The LSG-6000 validates solar panel efficiency under varying incident angles, referencing IEC 60904-9 (solar simulator performance requirements).
4. Urban Lighting Design
Street and architectural lighting must meet CIE 140 (road lighting calculations) and EN 13201 (European road lighting standards). The LSG-6000 provides glare analysis and illuminance uniformity assessments for optimal urban lighting solutions.
5. Medical and Scientific Lighting
Surgical and diagnostic lighting requires stringent photometric validation. The LSG-6000 adheres to ISO 15004-2 (ophthalmic instrument lighting standards) and DIN 5035-7 (medical lighting requirements).
Competitive Advantages of the LSG-6000
- High-Accuracy Dual-Axis System – The LSG-6000’s precision goniometric mechanism minimizes measurement uncertainty (<2%), outperforming single-axis alternatives.
- Automated Data Processing – Integrated software supports real-time 3D LID modeling, reducing manual analysis errors.
- Multi-Standard Compliance – Validated against IEC, ANSI, and CIE standards, ensuring global market acceptance.
- Modular Expandability – Optional spectroradiometers enable spectral power distribution (SPD) analysis for colorimetric applications.
FAQs on Goniophotometer Testing with the LSG-6000
Q1: What is the typical measurement time for a full LID analysis?
A full 3D scan takes approximately 15-30 minutes, depending on angular resolution and rotational speed settings.
Q2: Can the LSG-6000 measure UV or IR light sources?
Yes, with an optional extended-range detector, the system supports UV (200-380nm) and IR (780-2500nm) measurements.
Q3: How does the LSG-6000 ensure compliance with LM-79 testing?
The system’s calibrated photopic detector and traceable NIST certification meet LM-79’s total luminous flux and efficacy requirements.
Q4: Is the LSG-6000 suitable for high-power LED arrays?
Yes, the system’s 500,000 cd measurement range accommodates high-intensity LED modules and automotive lighting.
Q5: What environmental conditions are required for accurate testing?
A controlled darkroom (ambient light <0.1 lux) with stable temperature (23±2°C) and humidity (40-60% RH) is recommended.
By integrating advanced goniophotometry with industry-standard compliance, the LISUN LSG-6000 serves as a critical tool for lighting R&D, quality assurance, and regulatory validation across diverse sectors.
